What fish for my fish tank?

[Kenny]

I have a large 6ft fish tank with 4 red terrors only going to keep two when they pair off, 2 convicts breading pair, 2 jack Dempsey's breading pair, two red duel cichlids breding pair, 2 frontosa's 1 plec only a small one they are all happy and keep breeding which is a good sign. But I really want to but one more stunning cichlid into the tank to finnish it of any good idears something i am going to be able to get hold of i know all the fish are going to get big and there maybe not much space when there all big but there's loads of room at the moment it looks to empty always take something out later on down the line if i need to