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Your 'nominally' 90 litre tank, will actually be holding around 80 litres when you subtract the top inch of the tank that never is filled. You can subtract even more for displacement by gravel and rocks etc.if you have them. Then by applying the basic rules of fish keeping your absolute maximum stocking rate would be 35cm of fish. The basic rules and calculation for keeping any kind of fish are. 2.25cm of fish needs a minimum of 2.25 ltrs of water. :- Every tank needs a permanently running cycled filter. Every tank need to have at least 50% of it water changed evey week. Comply with the above rules and your fish stand a chance of surviving. Fail to comply with them and I can guarantee that your fish will have constant health problems.

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14y ago
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11y ago

About two betta fish or maybe a dozen and half neon tetras or a school of danios

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11y ago

This will depend on the type of tropical fish

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Q: How many tropical fish choices for a 90 liter tank?
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