I'm not trying to be offensive, but it just doesn't make sense to ask your question. Basically your asking what cat would work in your tank, but saying you know nothing will due to the size. Why ask for advice if your really not up to taking any? You've obviously made your own decision about tank size and fish compatibility, so why ask? You've taken some very aggressive cichlids and crammed them in a small tank. I personally overstock often due to selfishness, but I try to choose my fish better. Highly aggressive, territorial fish housed together are always a risk. Your just asking for disaster in such a small tank.