01-06-2010, 07:09 PM
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For the tank size you're dealing with the only one's that would fit (the tank size) is Danio's and Cory's.
The problem is they're very active and fin nippers if kept in small groups (like yours) that being said tosses out most other small fish (that would be idea for your tank size) out of the list and the bigger one's they'd get along with simple are too big for your tank size.
Was this my tank, I'd add a group of Cory on the bottom