I had the same thing happen to my green BTA, he hid behind the rocks on the bottom of the tank for about 2 weeks so I took the rock he was on and moved it towards the front closer to the lights. It was also hard to feed him because he was in an awkward space. He didn't look too good and I was afraid he wasn't going to make it, but I've had him for almost 2 years now and he split twice. Good luck, just keep an eye on it and make sure it eats....