I definitely wouldn't get any more than 1 Dwarf Gourami for a 10 gallon. I have 2 in a 46 gallon and they have the ocassional altercation. Nothing major, but they definitely like having their own space. I don't think that 2 would be very happy in such a small tank. Personally, after having the pair that I have, I wouldn't put one in a 10 gallon. Just doesn't seem to be big enough.