My first rbta had a few tentacles shrivel up and fall off. Been a happy camper until today, it moved into a cave and split then came back out all withing 4 hours. My second bta never closes it's mouth when the lights are on. Before the lights come on and at night it shrinks down (it's foot is on the underside of a rock). It always takes food and looks completely happy but it's mouth is open all the time, nothing coming out.