i have him in a established 55 gallon tank, the water is ver ygood(nitrate below 10, nitrite: 0) he sometimes hides under the gravel, even if the temp is at 79F., but he doesnt eat i have never seen him eat the bloodworms!, i have used a turkey baster and put the bloodworms in his face at night but he won't, he just stares at them until they land in the gravel!, he has been in the tank for 2 weeks and 2 days now without eating( i believe), he is 8" long, and i bought him from petsmart, he is very healthy but shows no interest in the worms, prettu much anything. there are big plants as well for hiding. i never turn on the lights, ever since he came.