Candy Coral - Turned Black

[RaymondL]

Got my first LPS coral - a Candy Cane, and I accidently bumped it into another rock gently while moving it around - it almost immediately went black on the parts that 'hit' the other rock. Being relatively new, I didn't know that this can happen with corals, such as. What does this mean, and will it recover 'repair' itself?

Thanks

 

[Lavey29]

Pics? Corals can close up tight as a defensive mechanism.

 

[RaymondL]

Pics? Corals can close up tight as a defensive mechanism.

Here's a pic:

 

[vabben]

Maybe some tissue damage, but I wouldn't worry. Candy canes are pretty hardy corals.