I bought a bta from the lfs about a week ago it was stuck to a rock so i bougt the rock too. It was eating a coral banded shrimp so I new it was healthy. I added it to my tank he climbed off his rock and into a crevice on mine. Now at night time it hides some of it tentacles and makes the rest longer. During the day it makes huge bulbs and twice as many tentacles but they are alot shorter. I fed it two days ago and it ate a piece of shrimp he ate it. I tested my water quality it seems to be all correct Please help!!!!