IME most LFS dont want big fish, and they are treated just like what you were talking about, shoved in a tank that is too small with many other tank mates. You might find one that will take them, but most people want to raise thier fish from juvi's, I have only traded one fish in before and it was for a good reason. Angels might be cichlids, but I dont think they would fare well against a breeding pair of convicts. The only reason I thought breaker should trade his fish in is because of the size of the fish, somone may still provide the fish with a good home. its kinda like older orphans ya know, no one wants them when they are not babies anymore. eg there is a fish shop that I dont go to that often, owner pissed me off cause he was trying to tell me that if I didnt buy RO water from him that my fish would die, anyway they have a full grown oscar that they want 50 bucks for, I went back to the store 3 months later and guess what, he was still there housed with two other oscars and two pacu all about 12" or so. I just wouldnt want my fish to end up like that.