Hi! So I currently have a 75 gallon tank with 10 Paracyprichromis nigripinnis (All about 2"), 5 adult multis (and a million babies/juvies), 1 Neolamprologus cylindricus (About 2") and 6 Synodontis lucipinnis. I am kind of second guessing my thought of getting the lone cylindricus. I wanted a nice looking rock dweller to help keep the multi population down but, he's now taken over around half the tank and wont let anything besides the Synos near the rock work. I'd read they were a pretty aggressive species but that it was more towards their own kind. Would I be better off trying to get a pair of Calvus for this tank/task and re-homing the cylindricus? And if so any pointers on where to get some? Thanks!