Chalice Receding

[salmonslayer]

Hi, I have a few Chalice that are receding around the edges. Checked water and all is good. Sps,zoas and all other corals/fish are fine.
Why I ask is a friend said he seen somewhere that there is a Bug or pest that eats Chalice. Help please

 

[snorvich]

Where are you keeping it? Low flow, low light?

 

[that Fish Guy]

Hi, I have a few Chalice that are receding around the edges. Checked water and all is good. Sps,zoas and all other corals/fish are fine.
Why I ask is a friend said he seen somewhere that there is a Bug or pest that eats Chalice. Help please

What is this Bug/Pest?

I think I have it as all my Chalices are receeding.