Because of its aggressive nature, this voracious but easily tamed fish should be raised in isolation.
if aros are mixed with other fish from young their is no problem keeping them with tank mates that are to small to eat
i also dont agree with keeping the water level in a tank low (3/4 full) one you have less water in you tank the more water the better thats why big tanks are far more easy to take care of than a big tank
if the water level is low it give the aro more space to propel its self out of the water causing more damage once it hit the top tank glass cover of you keep the water level high the aro doesnt get as much time to use the full power from its tail