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Definitely not turf.Looks like s turf algae. Cover with epoxy if able. If already invasive you will have to fine something that eats turf algae.
I've checked everything before I asked. Maybe a CladophoropsisHave you checked out ReefCleaners nuisance algae ID guide.
Haha looks like I am going to need it. Didn't find it on saltcornerIf you don't get an ID and you haven't tried Salt Corner. Com you might try there. The site has an exhaustive algae ID section.
GL

