I would like to put corys (or is it spelled cories? corries?) in my 10g betta tank. They need to be in groups, I know. If I got 4 corys at 2.5" each, that would be 10" of fish. If my tank had enough bacteria after cycling, would it be ok to put a betta and 4 corys in the tank? If not, other stocking suggestions would be great.