If it is algae, I've had that happen before too & it never hurt the seahorse. A lawnmower blenny will suck down stuff like that but the seahorses really hate that kinda loving attention  The main reason my 4" blenny is in exile in the 20g.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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