I bought a 4" Beani recently and put him in my 180g that currently has a 10" jaguar, 8" JD , 7" blood parrot and a 3" green terror , the green terror had both the jaguar and jd hiding and running away from him I think there was something wrong with that green terror his aggression was next level and loved fighting , my other fish did fight back a few times but seemed they didn't have the energy to keep up with the little guy, anyway I put beani cichlid in with them all and as predicted the green terror started bullying him when ever he came close , this lasted 1 day then the beani decided enough is enough and started to fight back , I beani when angry is focused on one thing and one thing only fighting and neither was backing down but the beani was certainly winning, I already plan to move the beani asap as this fish doesn't back down once it has decided to fight a certain fish , my jaguar see's him off at the mo but this will not last at a guess , the beani is always with or around the jd but again I believe from my limited experience with these that they are best kept separate, that being said my fish tank is very calm now the gt has a new home and I've seen no aggression from the beani since and my fish tank is currently calm and all swimming around open but that 1 fight I watched was enough to know the beani seems different to the other cichlids .