Pycnogonid / spider

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Acro-eating spider
Critter Category: 

The Pycnogonid is a sea spider that apparently preys on SPS corals like Acropora and Pocillopora.  These are very hard to spot, and require a keen eye to even notice their presence.  Hobbyists wait until lights out and use a flashlight to spot this pest.  No known predator at this time, they are removed by dipping the coral in a solution like Bayer, CoralRx, or similar.

Photo by Brandon Templin.  

Additional information and an excellent picture here: