well, ive been told that in captivity thay can reach 2 feet, and close to 2 meeters in the wild. but any ways, there are ways to get him onto pelets. i know of one person who has done that, and now i am going to attempt that. basically, if its with other fish, you feed him fish at first, if he is large enough. than you start putting in other foods, like blood or black worms, and get him used ot stuff that sinks. than eventually use sinking pelets, and than youre golden, feed him that for a while than once and a while give him something live. if you are going to go completley one live foods, try to gut load, that way he gets proper nutrition.