So i purchased a beautiful what looked to be a finger leather coral about a week ago and it seems to be dying!! When i purchased it, it was a beautiful orange color and the day after i put it in my tank it opened up beautifully and looked to be in full health. A few days later I noticed that it had retracted completely and is still fully closed and a dark blue/purplish color. What would have caused this and how can i get i back to full health!?!