07-26-2008, 11:28 PM
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I would actually get rid of the danios entirely. That would leave room to add another 1-2 cories. However, if you want to keep them, definitively add more to the group.
A single rainbowfish wouldn't work as they need to be kept in groups. If you keep a rainbow by its self it will just hide all the time, which wouldn't make a very good centerpiece.
Dwarf gourami can be territorial, but mostly to other territorial fish and/or top dwellers. The swordtail may get chased or nipped at a bit, but I don't think they would do each other any harm.
A Bolivian Ram or a Blue Ram would make a great "centerpiece fish", they're not very aggressive unless they're breeding, and since you'd only have one, that wouldn't be a problem. Kribs would work well too.
There are also some other great species of gourami that you could try. I love my honey gourami, they're very docile and shy. A female betta or some wild type bettas would also get along well.