I have a Rock Flower Nem that’s been in my tank for about 10 days now and he won’t attach anywhere. He’s been rolling around making a mess of the tank. I have others in the tank with no issues. I’ve tried digging him a hole in the sand, base of a rock, on a rock and nothing is working. Right now he’s blown up and upside down. Is it dying? Not sure what else to do. Thanks!