Arco damage: What could be doing this?

[AlexG]

I have a number of acros and the frags I have had for some time which have been growing nicely. However some of the newer frags in the display seem to have been damaged like something has chewed on them a bit voodoo magic pictured below, fox flame, and unknown sp. I have not seen any of my fish bothering the acros but it's not to say it might not be happening. I had one hermit that was a little larger quarter size but I am doubtful that is the culprit. Looks like the damage took place over a daybor two and has not gotten worse. I will try yo get some additional pictures.

Has anyone seen this before?

480 gallon tank
Fish:
Yellow Tang
Purple Tang
Sailfin Tang
Tomini Tang
Blue Hippo Tang
Fairy wrasses
Melanurus wrasse
Azure damsels
Royal gramma
Dragon face pipefish
Longnose hawk
Various species of cardinal fish
Spotted mandarins
Juv Flagtail trigger (just relocated to the big fish tank) was in the tank when the damage occurred.

Inverts
Black foot trochous snails
hermits

 

[Graffiti Spot]

Looks like it got burned but it also looks like there are circles on the tip which would make me think aefw but they don’t generally eat the coralites first. But then again it’s a tiny frag so maybe they didn’t have a base to start at. Could just be burned or something messed with it.

 

[CoralWealth]

That looks VERY similar to what I had a couple years ago and it was the causing of a bug similar to red bugs but it was greyish color. 4x interceptor dose knocked them all out and corals rebounded so fast. See if you can look at them really close with magnifying glass and see if you see very very small pod looking things running in and out of the coralites.