Noticed this on my new favia (favites?). Thought at first it was just some detritus but it didn't blow off with the turkey baster and it's definitely getting bigger. Thank you!
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I’m going to guess some kind of hydroids. Got any pics of it under white light?
Oh, interesting, those do look like they could be it! Should I be worried about it? Or just keep an eye and see if anything seems bothered?Yeah, I'm guess some kind of (probably thecate) hydroids.