5-6 inches...he does eat. He hids under that root thing all day but every once in a while he will come out and sniff around. He eats blood worms and brine shrimp. I cut up earth worms sometimes too (really small). I havent seen him eat pellets yet . he is really cool. I will be moving him to a bigger tank soon so hopefully i will see more of him then. (or less but hopefully more)