Hey guys im having a jewel cichlid population problem. they are everywhere, outnumbering my juvie bluegill population by far and theyve started to make a dent in my gambusia population. they are mean african species and i fear they will take over my pond if nothing will eat them. I currently have about 6 black bass, 3 tilapia, and 20-30(that i added, breeding might have yielded more) adult bluegill. The jewel cichlid numbers still arent declining and its been about 3 years since ive been keeping tabs on them. What can i add to control them?

Thanks alot,
Craig