why do fish tanks need filters but ocean fish don’t require filters?
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Size. It’s size, the ocean is stupidly big. Per gallon, oceans have way less fish in them and it’s hard to get a fish tank that isn’t basically polluted. But in order to fully understand, you need to understand how how fish tank filters work.
Contrary to popular belief, the primary filters in fish tanks are biological. Colonies of bacteria break down waste. Plants, algae, plankton and corals absorb waste from the water. For a while, this works fine in aquariums. But you get to the point where there isn’t enough space for these organisms to process all the waste the fish.
What filters do is try to compensate for this lack of space. They provide extra living space for bacteria (that’s what that sponge is actually for) or cultivate algae, or remove waste before it breaks down. They can also use chemicals to remove pollutants from the water.
But this is all to compensate for a lack of space in the tank. If you have a big tank with lots of plants or corals and not many fish, you can get away without a filter (do not attempt this if you don’t know what your doing)
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