Both Oscars and Red devils get very large. Keeping all but they tiniest ones in a ten will result in stunting, and a 27 will not keep them for long at all. I belive for a single adult oscar around 55-75 gallon is around the minimum, and a Red Devil will need even larger.
EDIT: Maybe a pair of convicts would live in a 27 gallon, so try doing some research on those unless you can find the space and money for a large tank
Last edited by MaelStrom; 07-30-2007 at 09:57 AM.
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