There are a few critters that eat red algae but I don't know if a Lawnmower Blennie would be one of them. I think they eat green algae. Are you sure that is gracilaria? Could you post a closer-up picture of it by any chance? Does it grow very fast? If a litle piece breaks off and lands somwhere does a new "plant" grow? I think Surgeonfish and Diadema urchins would eat that algae.
It might not be gracilaria. That's just what I was told. Here is another picture. I'm not sure if it's a better picture as I'm not good with the camera. It grows fast and on anything it lands on, including snail shells. It pulls off pretty easily.
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