Never mind. I just re-checked the piece w/a flashlight just now, and found nudibranches. Ugh, those little white things are gross!

I'm dipping the piece in lugol's solution right now! I just pray that I've caught this early.

Any personal experiences with these pests? I'd love to hear any thoughts or suggestions. Are they exclusive to monti's only or can they go after lps and clams?