I got a new spiny box puffer about a week ago. He seems to have adapted to the change well. The first few days he was moving around the tank all the time. Now, during the day, he finds a rock overhang or cave and hides under or in it all day. He doesn’t even move. If I put food in the tank he will move around a little, but he certainly doesn't go after it. He doesn’t seem to move much, like he is asleep. I have notice him moving around a little more at night but still, is this normal? I know they are typically nocturnal but is it normal for them to seem to attach themselves to the top of a rock cave during the day?