Thank's animal guy.
Dave, he was around 6 inches. His head has been getting bigger. When he spawns it will bulge out more. I feed him NLS pellets.
HHH, thanks, he is not aggressive. He is actually very mellow. He doesn't respond aggressively at all to someone or myself walking by the aquarium. I have never had him with any other fish though. He will occasionally chase the female and pleco.