I've had one for a couple of months now. He's currently about 3" in a 33g with a Convict and a Bristlenose soon to move into a 52g.
He seems to get on quite well at the min with the convict, but he's definitely the boss. I tried to move him into my 52g tank a few weeks back with a green terror, but he [salvini] killed him pretty quickly. I moved him back with the convict and all's well again... for now..
That's a pic of him when I got him, at about 2 1/2"