I have a new RBTA that I got about a week ago. He seems to be hiding from the light by hanging out near the sand bed under a rock arch. Last night after the tank lights went out the lights in the adjacent room were still on. He moved to the front of the tank and fully opened for the first time like he was trying to suck up as much ambient light as possible. Is there anything I need to be worried about here or anything I should do differently?