Hello, I currently have 2 banded leporinus about 6 inches each, 1 eclipse catfish 6-7 inches, a rainbow shark 4 inches, and a mono argentus about 4-5 inches in a 45 gallon. I know they are getting to big, so I am setting up a 165 gallon tank (tall) to put them in. Tank is 4 foot long, 2 foot wide, 31 inches deep. I know the mono is suppossed to be brackish, but I bought him a long time ago when I didn't know anything about fish and he's done well in freshwater so far. In fact all of these fish were purchased before I knew what I was doing. LOL These fish are all very aggressive, they used to have a few other tank mates but they killed them all. My question is what kind of cichlids could I try with these guys, cuz obviously they don't need all 165 gallons. Wanted to add a Ps. demasoni, was told that would work, but what else could possibly work? Prefer not to have any massive frontosas or anything that large, although they are cool. 
Thanks for taking the time to help.
Thanks for taking the time to help.
