ummm if u guys are settin up a new tank and u get a pike cichlid like a xingu 1 (orange pike cichlid) it works well cuz hell get really territorial as long as u give him a few caves to retreat too then u keep like smaller rbp in there but once u cross the number of 5 for a shoal of them rbp's theyll attack nething. ive kept rbp, rhom, and what was called a gold p. the rhombus devoured 2 plecos over the time of 3 years, he was only 4" and the plecos 6". but my brother and i kept rbp shoals for like 4 years and if u get some small babies and put them in with something that was in the tanks first they seem to not mind it but the xingu 1 will fight back and almost bully the rbp's when they fin nip him hell go in and beat up the whole shoal thats just what me and my brother have noticed also he kept p bass with em and it works the same. idk just a thought guys just thought id put my 2 cents into this convo