They look like vermetid snails to me. Nothing really eats them in our reef tanks to my knowledge. The more food in the water the quicker they will grow. I would scrape off what you can if you want to get rid of them. Here is some more information https://reefbuilders.com/2023/05/11/how-to-get-rid-of-vermetid-snails/Looks like I have either tube worms or feather dusters. I would like to get a clean up crew or fish that would help with this. If anyone had success with removal with either clean up or fish please share your experience. Thank you
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