critter id need

I got my first batch of coral frags on Tuesday. I dipped them using CoralRx put them on new frag plugs and put them in a QT tank. I noticed what looked like little white hairs or tentacles on the stony base/skeleton of one of the acan frags. I took some pictures to post to ask if this was normal...

Is this a group of small feather dusters on my frog spawn?