Most will tell you not to, but I've been lucky enough to keep mine with cichlids with no problems. See my signature, my BGK has been with all of them at one point or another(including my GT). In my experience, I have never had a cichlid act remotely aggressive towards my BGK, I call it the weird factor. When I first introduced it to my tank, my jack was an 8" horror movie style killer, there was a divider dividing him off from other growout fish and the 3" BGK (now 5-6"), the BGK had a bad habit of getting around the divider, even then the jack would get close but never attack, and would often flee quickly from the BGK, pleco's and other growout that found a way past divider were all beheaded. These days my 8" male jack and 5-6" BGK are often side by side at the top of the tank eating blood-worms (meant for the BGK but my jacks a gluten).