I got four rock flowers a few days ago. I left a couple of them in the containers they came in, so they were acclimated to the tank. But I finally decided to remove them and get them onto the sand. One of them seems to have taken this poorly. When I got home today, it had basically burrowed itself under a rock and had sand on it, and had receded in size. The others look great. Should I turn down the lights for a few days? What signs should I look out for if this is going further south?