I got my serpent star a week ago, he seems to have been in the same space for a long time now. He is in this ole in the rock where I can see him at all hours of the day. He is constantly moving his tentacles back and forth so I know he is alive. When I turn the lights on in the morning he is slighty out of the hole but he will quickly retreat. I don't hink he has left there since the day I got him. Is this normal or is the something wrong with him?