why do fish tanks need filters but ocean fish don’t require filters?
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Fish in fish tanks live in the same 10/20/50/100 gallons of water. That water will get polluted with their own waste and with algal growth, which needs to be filtered out before the concentration is so high that it hurts the fish (think of living in your own sewage system).
In the ocean, the volume of water is so large that the fish can’t pollute it all that quickly. Additionally, there are other things in the ocean that will naturally “filter” it, like mollusks and other filter feeders. So the ocean will ***usually*** never get so polluted that it becomes toxic. There are cases of algal blooms or human pollution that can certainly damage local wildlife, but those are not the typical conditions for ocean fish.
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