I currently have about 15 4" Peacocks and 6 African Cat's. I also have two Placidochromis milomo's. Can I add two Neolamprologus tretocephalus? and/or one Neolamprologus sexfasciatus? and/or six Neolamprologus leleupi? Currently the tank is great and everyone gets along. I really want to keep it that way! Suggestions will be greatly appreciated