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I thought a f.d at first but I've seen it when it's not been so close to the flesh of my hammer and it's wafer shaped and my copperband leaves it be and he eats everything like that like the clam I had growing in my Aussie torch the bugger! Lol
Check out videos on cucumbers feeding with their tentacles. If the behavior and movement is the same, you've got a cucumber. They're generally reef safe.
It's not a cucumber or a bristle worm I have a couple of bristles and the only way I can describe what it looks like is a moth wing furry ish I have seen it a few weeks ago before it latched itself to the coral itself I'm really stumped on this one!