06-21-2011, 01:32 PM
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Definitely more. As you have space, a group of 9-11 of each species would be best; the more there are, the more relaxed and natural the fish will be, and that can be very entertaining when they interact as they would in the wild.
And speaking of groups, your cory is also a shoaling fish that live in groups of hundreds in the wild. At least 5 of a species is best, though 3 will work if there is more than one species, but I would never have less than 3 of each species if at all possible.
And Silver Dollar is also shoaling, a group of 6-7 minimum would be best. Another reason to increase the tetra group is fin nipping. Many characins will take out their frustration at being in small groups of their own species by becoming somewhat aggressive, frequently first seen as nipping fins of larger fish, and the SD is quite a temptation.
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