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I would advise that you go tropical because they are smaller fish in general. The species I advise are also common, pretty and reasonably priced. I would say choose from Tetras, Danios, Rasboras, Barbs, Gouramies, and Dwarf Cichlids. Please remember the rules:- 1 inch of fish needs a minimum of 1 gallon of water. :- Every fish tank needs a cycled filter running 24/7. :- Every fish tank needs to have at least 50% of its water changed every week.

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Q: What are good fish that fit in a forty gallon tank?
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