From what I have read on this BB and some of my own experiences before I knew any better, it is not a good idea to have seahorses with a lot of other fish. This is mostly because the other fish snap up all of the food before the seahorses can get it, as they don't move all that quickly. I think that most people keep them in seahorse only tanks. I could be wrong, but I don't think that they like a lot of current, either.