panda corys are schooling fish and suggested number are 6 --
-- i'd say at least a 10g for qt unless you're doing the extra water changes and you get them small
--they grow to be.....i forget. 1.5-2.5 inches? they're small, and good sorority companions
-- you can feed them algae wafers, but will eat leftover food and dead plant matter in your substrate
-- sharp gravel isn't a good thing for them, they can injure themselves when looking for food, so freshwater sand is best if you can find it. My PetSmart didn't have it so I opted for some of the gravel I normally use which is much smoother.
I checked ont hem this morning and they're adorable!