I have 2 pim pictus, they keep out of the way of the cichlids and are quick enough to do so easily, but tend to hide when the lights are on. They grow to about 6 inches and like a lot of fish are only aggressive in the fact that they will eat other fish that fit in their mouths.
Mine regularly like to sit in the caves that my Acara uses and he kicks them out when there is a specific cave that he wants.