other than the usual "your tank is too small", which i wouldn't tell you anyway, other than you're eventually gonna need a bigger tank.
I keep a silver aro with my big peacock bass. My C. Ocellaris (Dozer) and my silver aro (pinky) have been tank buddies and constant companions since they were nearly new. They have defended each other against bigger and meaner fish and they have tamed the "wild" tems together.. lol.