I havent owned too many SA/CA cichlids (salvini, jaguar, GT, JD, and a few others) but now that I have my mota, I would have to say they have to be near the top. My little guy isn't even 3" and he's killed 5 fish and pushed a GT to deaths door, if I hadnt returned it on time.
I put in a new plastic plant in the tank the other day and he attacked it for about 5 minutes until he was certain it wasn't alive....
I can't imagine what he's going to be like at 10"+
Definitely plan on a solo fish or a pair, and is say 100 gallon minimum for a solo male