I have a small C. Regani about 2.5" right now. He was in with a bunch of other ca/sa peaceful fish. But I swapped that stock out did some w/c and went from driftwood to all lace rock. However, I couldn't catch this little stinker. My stock now is of med sized ( but still juvi size 2") African Cichlids mainly predatory from Lake T. Realistically these fish should all be about the same size, same diet and more predatory than aggressive. That being said, I know things can of course change, but it all seems to be kosher right now. It's 110 and probably has 100 + lbs of lace rock in it. I even was thinking of added shells for some shelly pairs in each corner. Is the Regani going to kill or get killed even with ample space for 4, 2" fish and a 6" Irwini and 5" flametail pleco. I would have moved him but frustration got the best of me, but in all honesty he's eating along said them and they have such a similar body shape there's not even a little nip.