wwfstyle, yes thats what mine do, i was just worried that was not normal, for i knew they grasp the food with thir sticky tenticles then pull them selves inside to feed on them, murf set me straight , they do this to rejuvinate them selfs, with fresh water, they exstract and realease the old water , i hope and think they r doin good, but i am worried about my sebae, he looks grat and big .,, healthy but he is a wonderer, i hope he is not plannin a chemical attack on my others!!!:notsure: