I agree about Lake Malawi cichlids and Victorian cichlids, Tanganyika cichlids are awesome and some west African cichlids, Too each their own. Central American are by far my favorite. Most mixed tanks do have problems I agree at some point. Had to remove my Salvini cichlid the other day, he was pretty beat up, thankfully made a full recovery. If I plan on breeding them out it’s always species only. Cichlids always do best species only. I do have a few mixed tanks just because I like multiple kinds of cichlids and can’t possibly have that many species only tanks, but I keep a close eye on them. That is a very good response and true