hi i'm new at this and i just got a gsp about a month and a half ago. i put him in a baby biorb, he's the size of a nickel and when i first put him in the biorb he was really happy, eating well, and thriving. but the last week and a half he hasn't eaten anything and he's changing from bright green to a dark dark green and back again. i put some small snails in there and he used to really love frozen krill. but he hasn't eaten either one. i also tried frozen blood worms. and although he hasn't eaten he has a tiny bulge a little lower than where his stomach is. please help!!!