He's only 3-4" right now. As I told Amanda, I made a big boo-boo when I bought him - I didn't do my research. I posted about this in the fish forum when I got him but was embarrassed to on this forum after all that I read.
He's been perfect so far. He eats my coralline (which I could care less, and he might not if I gave him more nori) but nothing else in the tank but what I put in for food. He's a crazy swimmer/eater - a darter. I hope things don't change, but right now I absolutely adore him. I've had him for 6 months now.