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Out of these I dislike the GT the most. It gets just as large as both dempsey and a Midas/RD but I have yet to see one who is truly a "terror". (as far as the larger "aggressive" cichlids go). Yet I also know its all depends on the individual fish.
I have owned both convicts as well as fire mouths who I had to be re-homed. Either of these as a pair can fight off anything that can't swallow them whole.