Bald spots on Acros...

Reef264

Where's The Reef?
Hello all, I have a bit of an issue with every Acropora I have currently.They are losing tissue from the base up, and I haven't seen any water parameter swings to do this.I have readjusted flow, tried more lighting...still.So the other night I was viewing at night for pests and I see what I think are nudibranches eating my Acros!They are probably 2-3mm long, white, skinny, and kind of fuzzy looking.The corals seem to lose more tissue at night.

Any help, please.
 
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