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All fish produce ammonia so all fish need their water filtered to remove this poison.The basic rules for successfull fishkeeping are. 1 inch of fish needs at least 1 gallon of water :- 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 the above rules your fish will stand a reasonable chance of surviving. If you don't, then I can guarantee that your fish will be constantly getting sick and will die much sooner than it should.

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14y ago
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Q: Does a rainbow shark or irredescent shark or how ever you spell it do they need a filter?
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