02-04-2010, 12:44 PM
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I feel the need to caution you here, Josh. But first, welcome to the forum; it's nice to have you with us.
I am not of the view that acquiring two more serpae will solve your problem. It is true that this species are less inclined to nip each other with larger numbers, but that generally means 9 or more, although they may settle down a bit with 6. But there is also the problem of the tank volume. Even 6 in a 10g is going in my opinion to be stressful on a fish like serpae. Being of a disputatious nature, they need as much open water as they can get to keep out of each other's way. In larger numbers and in more space they might calm down. One solution would be to consider another species of similar looking fish and see if your local fish store would exchange; many will when they know the reason, after all, they want your business and they should be glad to see an aquarist who is concerned about the health of his fish. We can discuss other species if you find this an option; there are several very similar in appearance, though not so readily available.
On the corydoras, as Angel correctly said, they need to be in a group. Like the tetras, they are shoaling fish that live together in large groups and being in a group causes such fish much less stress, and that means they are healthier and have stronger immune systems to fight off various things. Whatever you decide on the serpae, do get a couple more Corydoras; with your one I would get 2 more, a group of 3 will work in my experience.