I've never had problems, they've always been on the receiving end in my tanks, then again they were with characins, other cats, and cichlids, some oddballs. Biggest I had was 9". By other cats I've only really had different blochii with each separate one, my most recent was with a sun and jag cat. Blochii always was dominant in all situations for me, and the jag was dominant over it in the most recent case. Sun cat didn't interact at all with it. Wolves were always present as well, hoplias to be specific. As for cichlids, it was jag, Oscar, Texas, jack Dempsey, buttikoferi, and probably more I can't remember. This is over years of keeping different specimens. They never lasted long with those guys. Oddballs, were gobies and leporinus, that's all I can remember keeping with them. Usually succumbed to wolffish bites. They were able to hold their own with everything else, not winning but I wouldn't say it was a total loss either.