Hang tight Mike! The dominate males wont start to turn until 5.5 - 6inches. First the anal fin will grow long and pointed then a light greenish blue sheen will appear underneath the eye and nares region and a dead give away its a male is a strong metallic blue color will form on the upper operculum. I haven't seen any female Gorillus blue with it yet And from that point on the black arrives

Heres an updated picture of HELLSCREAM. If you look back at my first post on this guy his color wasn't in like it is now. The bigger this fish gets the more his adult coloration came in