I was doing a pwc
and also doing some light vacuuming of the bottom of my tank and got a little too close to my brain coral. I accidently caught the brain coral in the suction. I didn't see where it might have "torn" anything but I've noticed that it hasn't gotten back to it's usual size. It's not inflated (like it's done in the past) and on the bottom of it, it's not the usual white color....a portion of edge of one corner is a pink color.
This has been going on for about a week. I've been doing some target feeding of this coral and it takes the food (FWIW).
The water parameters are as follows:
Ph - 8.1
Nitrate - .1
Nitrite - 0
Oh! and here's a before picture....don't have a current picture of it but I can snap off a couple tonight. http://www.aquariumadvice.com/viewtopic.php?t=100158