Bubble Coral

Here it is just after arrival.  Notice the sharp knife-like edges.

Here is the Bubble after it woke up.

And a closeup of the Bubble's polyps.  They are very delicate.

Here the Bubble is shutting down for the night.  Notice that in addition to the bubble shaped polyps, the Bubble Coral has tentacles with light colored tips.

And here is the Bubble in the middle of the night, with all traces of the polyps gone.

The same coral, viewed from above.  Pretty nasty and barren...