I want to be sure, as I just noticed a bunch of these tiny tubes. Vermetid Snails I'm assuming. You can see they are very small compared to the blenny's head. Haven't see any mucus yet.
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Seeing this last picture I would say vermetids like mentioned above.I have not seen anything protrude from the tubes, perhaps nocturnal? I'm now looking with a magnifying glass and there are lots of them, still tiny, but lots.