CichlidFish.com - Fish That Think.

I have an O in a 75 Gallon, what are some other fish that i could put in there, maybe a Severum? or firemouth.

I was hoping to put Rams in but i hear they will get eaten.

I tried another O but my oscar fought with him, and i've got a red devil in there now, but the O is chasing him around the tank.  Is that normal when adding a new fish and it might stop.  Or will it just continue.  I might have to return this red devil.

Any suggestions would be great thanks!

I think the Oscar would be much happier in there himself. You should get a bigger tank if you plan on adding other fish. He probably feels cramped and doesn't have enough room, so he could very well beat up any fish you add in, unless you get a bigger tank.