hi, I have a 75g tank with one 2.5" JD, one 2" EBJD, a 3" common pleco, a 2" rainbow shark and 5 little black skirt tetras, there is a lot of aggression from the JD towards the EBJD. would getting a couple more ciclids help control the aggression and is so, what ciclids would you guys recommend. I don't want to push the limits of my 75g to far as these guys are gonna get big.