Bleached spots on staghorn

[CroMag676]

Can someone tell me what is going on with this Oregon Tort? These bleached spots keep showing up. They will slowly recover over a couple of weeks, but a new one will pop up. I don't see any bugs on it. There are some spots that kind of look like bugs, but if I hit them with a blast from a syringe, they don't go anywhere and more coral pigment is removed.

 

[Dburr1014]

Tell us your fish stocking list.

 

[CroMag676]

Tell us your fish stocking list.

Purple Tang
White Tail Tang
Radiant Wrasse
Dusky Wrasse
Yellowflank Wrasse
2x Pintail Wrasses
Solar Wrasse
Exquisite Wrasse
2x Fire Fish
Green Mandarin
Skunk Cleaner Shrimp
Fire Shrimp
Trocus Snales
Blue-leg Hermit Crabs
Sand Sifting Star