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Technically speaking, they'd "eat" anything that would fall into it's "mouth" as a large majority of corals do. But i do believe zoas and Palys sort of just digest them by releasing toxins. (sort of like a jellyfish) as opposed to something like a lobo or scoly that'll pretty much swallow things. It would take a decent amount of time though so not something I'd worry about. I'm glad you were able to get them out.
I have the same mushrooms mixed in with my zoa garden in progress
Its my only one. Not reproducing very rapidly either. I only noticed it drop one baby in like 9 months and that one disappeared before I could contain it.
recently I broke a piece of monti off while I was doing some tank work the other day. It was small, maybe the size of a quarter. I couldn’t see where it was, so I went about my work. A few minutes later I had to walk around to the display to see something and I saw the monti piece I knocked off just as the flower nem was closing its mouth on it. Haven’t see it since, I assumed it would of spit it right out, or at least the skeleton after it dissolved the flesh.