What is the average size of a mature Firemouth? I have a male Firemouth that is currently dominating my 50 gallon aquarium, and it is 3 inches long. Do you think he will breed with a 3 inch female? Or is he still too young? He is gorgeous, his fins are always flared, beautiful red throat, and nice long fins. He spends his time chasing my other cichlids. I know getting him to breed is most likely going to triple the amount of aggression that already exists, But I will have him removed to another tank by then.