I'm surprised no one mentioned umbees yet.
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So far your suggestions are
1. dovii,beani,umbee,Red Instalanum, Red Tiger Mot >>> 2. Red devil,jaguar,sagittae,trimac,festae,large pike cichlids
I think also a black nasty can go with 1. What do you think about buttis? I think this is a great list but 400G may not be enough if to put them all together.
(emperors,peacockbass,redbaysnook,convicts,neets were cut off because of their size)
So extract some of these and make a your own list if you'r to make the meanest 400G cichlid tank.