my 1 year old, 18-inch jar grew up with a Loiselli, synodontis cat and a pleco in a 100 gallon tank.....all are in there still, the Loiselli (now 8-9 inches long) usually keeps to a corner, and he does get nipped and chased once in a while, usually when feeding them. I did add 3 tinfoils in the 4" range and he slowly killed them off over a couple months, they just couldnt take many hits and eventually died from their injuries, but he only would hit them on accasion......I always feed the jar first, and then the others.......cycling a 220 now, and will keep those guys together in there, and am going to add a few more.....Motoro stingray will be in there before I put the jar in.....wish me luck!