What’s up with this monti?

[L8 2 RISE]

Any ideas what’s going on with my strawberry fields monti? It got these white patches about a month ago and seems to not be getting any better, or worse.

 

 

 

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[dpassar12]

It could be the chalice sweeping it at night or nudi's 

[epleeds]

It’s that vermitid snail on the left front of the monti. It’s the mucus that irrates the coral. Break it off and toss it in the trash and the coral should recover