What could put craters/holes in sps?

[Maddoggvup]

What could put craters/holes in sps? Deep, not just flesh. This happened fast, a day or 2. I have sps right next to it that seems to not be affected. I tried to edit the first pic so you can see how deep the damage is.

 

[MaddyP]

Those look like bite marks, maybe from a beaked fish. Do you have any triggers in the tank?

 

[Maddoggvup]

no. sailfin tang, six line wrasse, diamond goby, blue green chromis, green mandarin, 1 cleaner shrimp, 2 fire shrimp.

 

[MaddyP]

Interesting, it could be some species of crab that made it into your tank. A good bet would be to try and catch them after lights out with a red light. See if you find anything sneaking around the corals.

 

[Maddoggvup]

I had the frag for about 6 months. Could A crab climbed straight up the glass on to a frag rack that is on the glass at the top of the tank? Could it be the cleaner shrimp? I seen it by the frag tonight.

 

[Maddoggvup]

Other sps right next to it no problem...

 

[MaddyP]

I had the frag for about 6 months. Could A crab climbed straight up the glass on to a frag rack that is on the glass at the top of the tank? Could it be the cleaner shrimp? I seen it by the frag tonight.

I’ve seen crabs make it up the silicone in the corner of tanks, it appears your rack is near the corner? I don’t think a shrimp could have done this pattern of damage.