They can be territorial once fully settled in. There's always the possiblity that your FM and blue and black parrot could pair up and compete with the EBAs. Right now, we know that you have aggressive green terrors.
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Maybe a 6 foot 150-180 gallon. Better yet something like an 8' 240-300 gallon. The problem is gonna be the terrors fighting over territory and picking on the smaller cichlids they see as competition.Sorry guys, what do EBA and FM stand for? Is there any size tank that would house what we have or will we need to get rehoming?