07-02-2009, 08:48 PM
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Corys and bettas will get along just fine, but corys are shoaling fish and should be kept in groups of around 5-6. Adding onto that, most species would be to large to put the right amount in a ten gallon. I'd suggest perhaps 5 Pygmy Corys? They'd be the only ones small enough.
They also do best in sand substrate, though small, round gravel will do. So long as their aren't any sharp pieces of gravel/the gravel isn't too large you shouldn't have any issues
Unfortunately it is a common misconception that they are good 'cleanup fish'. They will eat flakes(or pellets)that fall down to their level but need to be fed on algae wafers and shrimp pellets daily as well.
Hope this helps