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Fish do not need an air filter. They need a water filter. No fish will survive for long in a tank that has no cycled filter running permanently. The only way to avoid death under these conditions is to replace heaps of water very regularly to remove the ammonia that is created by the fish. The basic rules of sucessfull fish keeping are.The basic rules are. :- 1 inch of fish must have at least 1 gallon of water.(1 Oscar needs at least 15 gallons) :- Every tank must have a permanently running 'cycled' filter. :- Every tank must have at least 50% of its water replaced every week.. If you follow those basics and keep the fish at the correct temperature, water pH and GH, for its species, your fish should be OK. If you miss out on any of the above, your fish will be constantly getting sick and will live a shorter life than they should.

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15y ago

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How long can fish live without a filter in their tank?

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