Brown algae is a form of algae called diatoms that can photosynthesise as well as eating chemicals in the water. So they can survive even in low light levels as long as their alternative food sources are available. Silicate, phosphorus and nitrates in the water are potential food sources for them.
Recognising brown algae.
When you see a light to dark brown blotches which appear as a slimy film covering any aquarium surface then you are highly likely to have brown algae. It is easily displaced from any surface and can be vaccuumed off glass, plants and gravel.
What causes brown algae?
It usually comes about when there is low light levels, low green algae or plant growth and when there is an abundance of silicate, nitrate or phosphorus in the aquarium. This usually happens in a new aquarium. The silicate can come from the glass of a new aquarium leaching silicate into the water or from newly used sand leaching silicate. Sometimes the rocks in the aquarium contain minerals that feed brown algae so may need removing.
Is brown algae harmful?
It can be harmful to plants or corals because it can coat them and block sunlight and nutrients to them. It the algae starts to die it can cause pollution problems. However, many algae eating fish will relish brown algae and is generally not harmful if it doesn’t overly cover plants or corals.
How can you cure brown algae?
The best way is to deprive the algae of the nutrients that the it feeds off. Correct the lighting problem, such as buying a new light if your aquarium bulb is old or buy a brighter light. The algae will take up the nutrients from the newly set up tank. Once the tank has matured the algae should run out of food.
The second way to cure brown algae is to continually scrape it and syphon it from the aquarium. The nutrients locked inside the brown algae will also be removed along with it. When you scrape off the algae make sure it is removed from the water. If it is allowed to remain in the water it will simply re-attach elsewhere or it might die and leave silicate in the aquarium water, so will re-appear. If the water you are using contains silicates and phosphorous then you might either need to put silicate/phosphorus remover in your aquarium or you could try mixing tap water with reverse osmosis water.
Removing any suspect rocks or gravel in the aquarium and replacing with safer gravels without silicates or phosphorus. Sometimes all it takes is to wait for the aquarium to cycle and mature. The brown algae usually gets overtaken by green algae.
Add a couple of otocinclus catfish which will devour it. In a saltwater tank fish like yellow tangs like to eat it too.
I suggest you avoid any chemical treatments to kill off the brown algae because of the side effects on your other tank inhabitants and the harmful effect on the biological filter.
Preventing brown algae.
Use good lighting. Set up fast growing plants. Use safe gravel or aged sand. Check out the mineral content of your rocks. Do not overfeed the fish. Make sure you cycle your aquarium properly. Use a silicate free source of water such as reverse osmosis water.
Brown algae in a saltwater tank
Check for silicates in your saltwater mix. Look through the list of ingredients to see if any silica based compound is in the list. Try using reverse osmosis water rather than tap water for your saltwater mix. Make sure you clean the brown algae off the corals daily. Use a phosphate/silicate-absorbing material in the filter.
Saltwater fish food is not as easy to get right as for freshwater fish. Depending on the type of marine fish you have, they will have different feeding needs. There are the seafood eaters who will require bits of fish or seafood tidbits. Then there are the plankton feeders who need to be fed with small foods such as baby brine shrimp, frozen cyclops and mysis shrimp. plankton feeders will need to be fed many times a day. If you supplement their diet with pellets these will have to be crumbled into the tank so that they can pick up the pieces.
Then there there are fish that feed on plant life such as seaweed and will need to be fed with greens from the kitchen and algae. And finally there are the algae grazers who will need a diet that is mostly algae. All vegetarian food will try to eat throughout the day so food must be made available throughout the day for them.
Your first job is to find out what your particular fish eats then set about buying or obtaining the foods they need. Some fish will not readily take to dried foods so you will have to rely on live foods and plant matter.
Some fish such as blennies are bottom feeders and search for organisms through the mulm at the bottom of the aquarium. They may feed off uneaten food left by other fish. Take care to see that these types of fish get properly fed. You may need to feed them directly with sinking pellets for them to find.
The fish that eat meat and that includes carnivores and omnivores will eat most forms of seafood from your fishmongers such as sea fish, prawns, mussels. Always chop these up into bite size pieces. For fish like tangs the pieces need to be very small because they tend to eat small life forms. Always blanch the seafood in boiling water for 1 minute to kill off any potential sea borne parasite.
Various recommended saltwater fish foods
Algae sheets such as nori which is a japanese food available in delicatessans is a great food to feed saltwater algae eating fish. When it is placed in the aquarium you will see all the vegetarian fish go into a feeding frenzy for it. It contains many essential micro-nutrients that are not available within garden greens such as romaine lettuce and spinach. So must be provided as a supplement.
All fish in the wild eat live food or fresh vegetable matter. Many wild caught fish will not take to dried foods so must be fed live foods such as brine shrimp and algae. However, many fish can be persuaded to eat chopped vegetables such as romaine lettuce and other greens. Dip the leaves into boiling water for 1 minute so that they become soft. Seaweed in the sea is usually soft so softening greens will simulate seaweed texture.
Other foods for saltwater fish foods
Some saltwater fish may take dried foods or even frozen foods. You can soak the defrosted frozen foods or dried foods in a multivitamin supplement for saltwater fish. This will ensure that your fish will get any vitamins that may be lacking in the diet you provide.
Frozen saltwater fish foods are available such as krill, mysis shrimp or cyclops. These should be defrosted thoroughly before being fed to the fish. If your fish take to this then your job will be much easier. But there is no reason to not also supplement their diet with seafood scraps from the supermarket or fishmonger.
Dried foods are not really recommended because of the lack of essential micronutrients that is available in live and fresh food. On saying that some fish keepers do get away with it. As long as you soak the dried food in a good quality saltwater fish vitamin supplement and top up their diet with some seafood tidbits and algae then you should be able to get away with feeding dried food. With dried foods you need to be extra vigilant and remove any scraps of food that fall to the floor and remain uneaten at the bottom of your aquarium.
Make your own saltwater fish food
If you can set up a small saltwater algae tank on a sunny window spot then great. Your algae eating fish can eat fresh organic algae, the perfect food that they would find in the wild. When doing a water change or just removing water from the main aquarium, do not throw it away but use it to top up your algae tank. The algae will grow well from the fish manure. If you can get some small shrimps or other minute invertebrates growing in the algae aquarium then all the better. Your omnivorous fish will love the tidbits of livefood found in the algae.
Place sheet rocks in the algae aquarium so that algae can attach itself. Then move these rocks to the main aquarium for feeding. When the algae has been stripped away move the rocks back to the algae aquarium.
Growing Brine shrimp or other shrimp in a hatchery
You can hatch out and grow brine shrimp in a separate small tank. Use a sponge filter powered by an air pump. Keep the water heated up to 80F. The tank should be placed on a sunny window sill. Pour in your brine shrimp eggs and wait for them to hatch. After hatching they take a days to eat off their yolk sacs so should not be fed immediately. Feed the shrimp with yeast, wheat flour, soybean powder, or egg yolk. Do regular water changes to keep the tank clean. The salinity for brine shrimp should by at 1.018 specific gravity. If you look after the shrimp well then they should grow and breed providing you with a continuous supply of shrimps. Gut loading the brine shrimp before feeding your fish is a good idea. This is just means feeding vitamin rich nutritious food to the brine shrimp for a couple of days before you feed your fish.
Once your saltwater aquarium has become properly established with all the fish, corals and invertebrates that you want and the liverock has developed a healthy colony of de-nitrifying bacteria and other micro-organisms then your job should start to get easier. This process may take a few months.
Your daily routines now should include checking the temperature and checking the evaporation level against a pre-marked line against the water surface. Also check to see if all your fish and invertebrates are present. This can be done while feeding, when all the fish will come to eat. But don’t just check to see if they are present but also check to see if they are behaving normally and do not show any signs of injury or illness.
If any of the fish or invertebrates has died then remove it immediately. A dead corpse will quickly rot in the water and start to pollute the water and will eventually cause illness to other fish and invertebrates. After you have removed the corpse then your next job is to investigate the cause.
First check your water parameters, especially ammonia, nitrite and nitrate levels. Any unusual readings spells trouble and will require an immediate water change. Syphon off 25% of the water in the aquarium. Syphon in or near the sand where there might be some decaying organic matter. Then replace with clean saltwater to top up your aquarium. Try to maintain pre-mixed saltwater that has been allowed to settle that can be used immediately. If there are no unusual readings then check all the fish for any symptoms of illness. Look for laboured breathing, split or frayed fins, white/grey/brown spots, any slime or fluffy grey/white patches, any red sores. If you see any of these signs or anything similar then your fish have an illness and you will have to diagnose the illness using a checklist.
Once you have determined the illness of your fish then you can obtain the medication or treatment and start medicating your whole aquarium. But be careful in the choice of medications because some corals and invertebrates are susceptible to them. And be careful not to overdose with medication as invertebrates may survive normal doses but high doses may kill them.
However, if you cannot determine the cause of your lone fish death then it may remain a mystery. The cause may be a hidden illness of the dead fish, perhaps an attack from another fish or invertebrate or perhaps from an overcrowded aquarium. When a fish dies from an overcrowded aquarium then the death actually gives breathing space to the rest of the fish.
Invertebrates usually rely on scraps of food that are left over remains of uneaten fish food. If the fish do not leave enough scraps for them they can go hungry. Make sure you feed the invertebrates directly. remove any uneaten food after 15 minutes.
Weekly tasks for saltwater aquarium maintenance
Weekly tasks include checking ph is between 8.1-8.3. If it falls below 8.1 then you may have decaying organic matter in the tank. This causes a drop in ph. If there is a ph drop then check your ammonia and nitrite levels as well. Then syphon around the sand, looking for any decaying bits of food. Open up the filter and remove excess mulm by rinsing in a bucket full of aquarium water.
Another weekly task is to check the salinity level. First off, check the water against the original line you marked on the side of your aquarium when you first filled it. If the water level has fallen then you will have to top up with fresh saltwater (preferably reverse osmosis water) Make sure the water is the same temperature. Check your phosphate levels and calcium levels as well.
After this check the salinity with a hygrometer. Your reading should be 1.025. If the reading is less than this then you will need to do adjust the salinity slowly over many days. Everyday change 5% of the water with a freshly mad batch of seawater with a reading of 1.026. Repeat daily until the aquarium gets back to 1.025. Likewise if the reading was higher than 1.025 then you will need to change 5% water daily and replace with a mix of 1.024. Again repeat until you get the 1.025 reading again. If the reading was correct at 1.025 you should still do a 15% water change with water at 1.025.
Check the output flow from your filters. If the flow feels less than normal then you will have to take apart the filter. Place the filter material in a bucket of aquarium saltwater and rinse out any excess mulm before putting back the filter material into the filter and putting back the filter. Do not use tapwater or cold water to rinse the filter material because you might kill of healthy bacteria in the filter which you must preserve at all costs.
Scrape off any algae that has grown along the front glass. Do not remove any algae off other parts of the aquarium because algae is a natural biological filter that removes nitrates from the water.
Clean out the protein skimmer cup. If there is a lot of waste skimmed out then you might need to do this more often. You also may be feeding your fish too much. So consider reducing your feeding a little.
Lastly do a thorough inspection of all your corals. Check for any infections or lack of growth or bleaching of the corals. If there is excess growth then you need to trim them back. If the corals have become ill then you might be able to frag off a healthy piece to save your coral because ilness usually spreads to the whole coral. Fragging may be the only way to save it. Sick corals are best left undisturbed. The best way to treat them is by fixing water parameters. Usually high phosphates, high nitrates and change of lighting or water flow can be the cause. Sometimes invertebrates or fish may take chunks out of them.
Finally, if you don’t see any of the listed problems then well done! You are doing a good job and everything is running smoothly.
Larger aquariums are better than nano marine aquariums if you have the money
If you are a newbie marine aquarist, then you may be tempted by the lower cost of buying a smaller aquarium. Or you don’t want to commit to a larger aquarium until you know you can look after aquarium fish. So you might buy a smaller tank as a trial. This can be a mistake. If your dealer is persuading you to buy a larger tank then listen to him, if you can.
A small aquarium, especially a marine aquarium, is more difficult to cope with because of sudden water quality problems. In a bigger aquarium these problems are diluted by the larger quantity of water. Any rise or fall in salinity, pollution or other water parameter will be much slower in a large aquarium than a small aquarium. It is a falsity to believe a small aquarium is easier to maintain than a bigger aquarium. The opposite is true.
Comparison of large aquariums with nano marine aquariums
You will still need to buy all the same equipment for a nano aquarium as a large reef aquarium. For example hygrometer and water test kits. Some of the equipment is just miniaturised versions of the ones available for large aquariums, but the price is not miniaturised being about the same price. Savings in costs are usually made in the price of the aquarium, stand or cabinet, price of lighting, costs of live rock, cost of live stock because you will only be able to keep a small number of fish and invertebrates. Smaller heaters are a little cheaper. But the rest of the equipment is about the same, including on going costs.
Your first foray into keeping a marine aquarium will have a greater chance of success if your choice of tank size is at least 160 litres. With a tank of less than 160 litres, monitoring and maintenance work doubles. You will have to buy a good quality test kit that is easy to use and you will have to keep using it daily or even twice a day. The water has to be checked daily for salinity levels, ammonia, nitrites and nitrates. Adjustments and interventions will almost certainly have to be made more often. Things change so fast in such a small aquarium that salinity levels due to evaporation or pollution levels may change quickly and kill your fish or invertebrates in a day. In a larger aquarium these changes are slower and your fish have more time to adapt. And there is more opportunity for you to catch these dangers and correct them in time.
For many aquarists the prohibited costs of the larger aquariums leave them with no option but to start with a smaller aquarium. To be successful in a smaller aquarium your choice of fish and invertebrates must be made with more care. Corals from shallower waters are more tolerant of changes to water conditions than their deeper water counterparts. Also, your choice of fish is limited to the smaller and hardier species. Common clownfish, pyjama cardinalfish, dwarf angelfish and neon gobies make the best choices for the smaller aquarium and are great beginner fish anyway.
Once you have fish in a smaller marine aquarium then your options for invertebrates becomes limited both in the number and range of invertebrates you can successfully keep together with your fish. Shrimps and small hermit crabs are the hardiest invertebrates that might survive with fish present.
It is better to understock and overfilter for the first few months. It will take this long for your filters, live rock and live sand to fully mature. In this period you will get practice and experience of running your aquarium.
Maintenance of your nano marine aquarium
More careful attention to the diet and especially the feeding has to be made to make sure that the fish are well fed without allowing waste food to occur that will pollute the aquarium. If you good have experience in keeping fish then you will know what to do. For the less experienced, great attention has to be made to uneaten bits of food.
In a smaller aquarium it is better to have a protein skimmer and a uv filter. But don’t overdo it. The protein skimmer will remove essential nutrients while the UV filter may kill off helpful plankton. You must have live rock and live sand which will provide biological filtration. Once established this will greatly enhance your chance of succeeding.
You will have to buy the live rock. Cured live rock is better but more expensive than uncured live rock. Uncured live rock will cure in your aquarium. The effect of this is that pollutants from dying organisms will seep into your aquarium water for weeks until the rock cures. The live sand will develop by the migration of microscopic lifeforms and bacteria from the live rock into your sand. Also have a good external filter to perform additional biological filtration. Remove excess waste from the filter media by squeezing out once a week. Do not rinse out or you will lose the nitrifying bacteria.
Buying several small pieces of live rock and plenty of ocean rock is one way to create enough live rock in your aquarium but you will have to wait while the life from the live rock migrates to the ocean rock. This process takes time. if you have the patience then you can save money this way. Remember live rock will start to die when not submerged in sea water. Newly bought live rock from your dealer needs to be kept in seawater on the way back home. Make sure you buy solid live rock and ocean that is not prone to crumbling.
It is highly recommended to do many small partial water changes to the nano aquarium. Have a large container of pre-mixed saltwater. This will reduce the amount of times you have to mix water and sea salt to create seawater. The use of reverse osmosis water is highly recommended. Buy a RO water kit that will convert your tap water into pure water. Otherwise you will be spending a small fortune on continually buying RO water from your dealer.
Self contained nano marine aquariums
There are many self contained nano aquariums. These have advantages and disadvantages. Some are enclosed systems that reduce the water evaporation. The downside to this is that they tend to overheat, because of the enclosed lighting, especially in summer. The open top varieties are better in this regard but will require topping up with water daily to maintain the required salinity. Because of their all in one nature, these aquarium set ups work out cheaper. But invariably modifications will be necessary to these set ups to make them work.
Today, you have a better chance than ever before of having a successful nano aquarium because of
1. Advances in technology of filtration, monitoring and maintenance equipment
2. The wider availability of aquarium bred fish
3. Wide availability of good knowledge of the marine aquarium environment
4. The price of marine fish and live rock is falling because of the success of home produced sources
So, why not give it a try and start enjoying the colourful world of marine fish.
You can buy clownfish and dwarf angelfish online with home delivery in the US.
If you have been successfully keeping saltwater fish in a marine tank for a while then perhaps you would like to move on to breeding your fish.
Many keepers of saltwater aquariums are content to just keep fish. For the brave few I will outline the basic steps that you need to be take in order to ensure a healthy brood. I will assume that you are familiar with the basics of marine aquarium care.
Besides having a male and female fish, you will need to do some preparation for your fish if you would like to enjoy successful breeding:
• Breeding tank—You will want to setup a separate bare-bottom breeding tank that your fish larvae can comfortably live in until they become adults. It may help to have several tanks ready, depending on the size of the brood you plan on keeping. Large filtration is out of the question, but a simple air stone can help keep the water moving.
• Live food cultures—Fish fry will thrive if they given a continuous supply of live food. You will want to begin preparing your live food cultures before breeding starts so that you do not have to rush after your fish have bred. It is recommended to culture both rotifers and baby brine shrimp as the best two starter foods.
Many saltwater fish will begin their lives in a larval state, which often requires the set up of complex larval rearing systems in which multiple breeding tanks are connected to the main tank through a sump and constantly fed rotifers and live food cultures. If you are breeding your first tropical marine fish, it is advisable to choose fish that you can raise in a simple breeding tank without having to worry about the larval phase.
Selecting which marine fish to begin breeding
Since some marine fish require such a complex breeding set up, you, as a beginner, should focus on breeding easier species of saltwater fish that are simpler to breed. Avoid breeding fish that have a “pelagic larval phase”. The following list of fish have fry without a protracted larval phase.
• Banggai cardinals,
• Bristletail filefish,
• Green wolf eels,
• Neon gobies,
• Dottyback fish.
If you have a healthy pair of any of the above species in your tank, you can reasonably expect them to breed at some point. Most saltwater species will breed on their own when kept in excellent water conditions. However, certain species may take a long time to form a sexual pair.
If your fish are just not breeding despite keeping excellent water conditions with lots of hiding places then try moving your pair of fish into a low-light spawning tank. Orchid dottybacks, for instance, will breed readily when paired off in a small, covered tank with some decoration.
What to do when spawning begins
Generally, your job will begin when the eggs hatch. Up until then, one of the parent fish will usually defend their eggs, and will generally do a good job of it. Once the eggs hatch into larvae, however, you need to get them into a separate tank and get them fed.
Collecting your larvae from the main tank can seem like a difficult task, but one important tip can help: fish larvae tend to be attracted to light. To collect your larvae, follow these steps:
• Turn off the lights and water flow in your tank,
• Shine a small flashlight at the corner closest to the larvae,
• Let them accumulate in the light for a minute or two,
• Use a dip cup or siphon to collect them and deposit them in their own tank.
Raising the larvae of marine fish
Feeding the fry is the main stumbling block in reproducing marine fish. Many aquarists fail at this stage or lose all but a few of the fry. There is definitely money to be made for the aquarist who can successfully feed and raise a whole brood to a saleable size regularly.
Your fish larvae will need to be fed frequently and in large quantities. In the sea they would be surrounded by a rich variety of live plankton. Larval fish are voracious eaters and their appetite will surprise you. Moreover, their waste and waste of their live food will make frequent water changes necessary.
It is important to remember that your marine fish fry, being so small, will be unable to catch all of the food in the tank, and you will inevitably lose some food to waste and even some fish to starvation. These larvae need to have food within several millimetres of themselves in order to catch anything, which means saturating your tank with rotifers or plankton. Moreover these rotifers must be fed too. The rotifers must be fed with nutritious live algae. Ultimately this nutrition passes to the larvae via the rotifers. Algae can be raised with a light source and nutrient rich saltwater.
In fact, you may find that you are quickly running out of food to feed your fish, which leads to a very important rule: Never raise more fish than you can feed. You may have to cull some of the less fit members of the brood in order to realise this goal, but it will save the rest of them and ensure the health of the rest. A healthy minimum concentration would be 10-15 rotifers per millilitre of aquarium water in order to simulate the plankton they would find in the wild. A good system is to have and feed the rotifers in the same tank as the larvae. This, though, puts a heavier burden on the raising tanks oxygen demands and ammonia levels.
With frequent water changes, a well-oxygenated tank and lots of food, you should start seeing growth in your fish. The water changes will be very important since both your fish and your rotifers will cause ammonia levels to climb, and your filtration will be limited to fluidised sand filters, trickle filters and protein skimming – anything that uses greater flow will suck up the larvae.
Caring for your fish larvae
When breeding tropical marine fish, you will need to take care against bacterial infection. Siphoning out the waste properly twice a day should help reduce the risk of harmful bacterial colonies developing on decomposing organic waste. Your fish larvae have brand new immune systems that will not protect them from infection.
Protein skimming, again, can help greatly here by removing organic material and bacteria from the water column. A UV steriliser is also a very good idea for your breeding tank. If any of your larvae get sick, they need to be culled immediately to protect the rest of the brood.
Once your fish are large enough, you can begin feeding them baby brine shrimp as they gradually mature into juvenile fish and become ready to be weaned onto a diet of dried foods. While rotifers are ideal for the very beginning, eventually your fish will grow too large to be effectively fed by these tiny organisms.
One last important thing to consider: Since your larvae respond to light by moving towards it, any light source outside the glass of your aquarium will attract them. The result of this is that it will cause your larvae to bump their heads against the aquarium glass until they die. This behaviour also occurs if the larvae have run out of food. To prevent this you will need to cover your aquarium’s bottom and sides with a dark material.
If you have followed these instructions and researched the needs of your individual species, you will be well on your way to successfully breeding tropical marine fish for the first time!