My house has 2 tank sizes, 5 gallon and 10 gallon. So, how many harlequin rasboras can I put in both tanks?

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In a 5-gallon tank, you can fill it with about 8 to 10 small harlequin rasboras. Meanwhile, in a 10-gallon tank, you should fill 6 medium-sized harlequin rasboras so the fish can move freely and comfortably.

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