not normal, need some info though, is it closed up or is the foot in the air and the tenticuls on the bottom? if you cant see the tenticuls then its cloesed up, how long have you had it, whats your lighting, and water specks
Agreed, we need some more info. WHere is its foot located? If the foot is secure on a rock or sand then don't worry about it, but if the foot is not secure i'd be worried.