thats just it!! this is my first who grew this big...all my others were only about 1 and a half cm's at this age!! i belive the larger tank and constant lighting has a helped out alot. he does have a very odd personality lol, he likes to dig alot and has suddenly become camera shy!! i cannot get a pciture of him as he swims of each time i try! and like i said he has taken a liking to the sides, such a great little guy! shame he has no change in expression on his face lol