You RD is going to be a beautiful brute in a few years. Give him clean water and he will become a |V|ONSTER!
My last red devil grew to just over 30cm or a foot long and it was a female so I'm expecting him to get a bit bigger when grown. He already has an attitude problem, as soon as he sees you he rushes to the end of the tank gills flared but in saying that I can put my hand in the tank andsend him to the corner of the tank by pointing at him or just push him out the way
He is looking good, one day he's gonna shake a tail at you and charge though.
awsome fish mate