I was at the LFS
yesterday to get some live rock. In the live rock tank there was a seperate bucket that the owner explained was recently dead or dying coral. I chose the following two pieces.
Now its clear to me that the sencond one is not dead. Both pieces looked like the first until about 30 min ago when i turned off the lights. Now one of the 2 has clearly puffed up.
What should I do?