Found this on my "superman" Montipora* PIC'S

[NYReef]

Hi, any idea if this is just a harmless pod, or something worse? It was on my "superman" montipora between the polyps and as it moved it looked like some sand or somethings came off the coral. Any help is greatly appreciated.

 

[reefman]

Hmmm...what that is

Cirolanid
http://www.reef-aquarium.net/resources/livestock/critters/critters.html