no probs with the fahaka doesnot mind being housed with other agressive fish.just expect nipped fins or worse sooner or later. i housed him with 3 baby jags they robbed his food and just pushed him around a lot. now they have their own tanks.yes oc's and jags do make good tank mates,so far. i have never seen a male or female oc that was as mean,standoffish.or just tuff as a jag.