Fishman007
Aquarium Advice Addict
that's pretty much my stock list, but mine are in a 125. Your O won't be able to turn around in a 55. The O and JD would need a 75g min. each to themselves. They would tear eachother up in that space, not enough territory to claim. If I had read up on this forum as much as I have now before I bought my fish, I would try some of the lesser known SA species. A lot of them are smaller, different and beautiful! These guys could list them out for you. You could have more fish that way.
I'm keeping my JD separate from my O, even in a 125, I wouldn't trust those two =)
I already have a community tank and wanted to get some bigger fish.