I got a sebae tueday with a small percula that was being hosted by it Tuesday. I drip acclimated it for about 2 hours. I then was able to pick it up without it shrinking and placed it in the display. It tumbled around for a bit and got wedged by a rock. It moved across the tank and now looks like its planted fairly well. The color is nice and dark and its tenticles are long and swaying but its mouth is still wide open. From what I understand it should be closed. Should I be concerned?