Sun Coral won...
Had a really nice ice blue favia that was not far from where I place my sun coral. I feed my sun coral by placing a cut off plastic bottle top over it (to keep the mysis from being stolen by the fish and shrimp). I guess yesterday evening, when removing it, I jostled the sun coral a bit and it ended up being a little closer to the favia than usual.
So this morning, this is what I saw. Favia all white on that side, even the live rock in that area all white. The sun coral must have been stinging the crap out of it, or maybe even trying to eat it. The sun coral heads can extend an inch or more at times, and I guess it was just too close.
Sorry for the bad pic (don't have a proper camera yet for taking tank pics), but you can see the favia on the left, not looking too good.
