I was given a BTA the other day. I acclimated it and placed it into the tank. The rock it was on is basically shaped like an upside U and was on the underside of the U. When the lights went off it moved to the backside of the backside where there is basically 0 light ever. It has been there for almost a week. Is this normal? I can't feed it while its back there. Should I rotate the rock to put it into the light and where I can feed it?