I have to admit, it kinda creeps me out! We scrubed the live rock before we added it, could it have lived? Did it come from the live sand? Will it multiply?
You are right. We were sitting there looking at al the new colors on the rodks and I noticed what looked like a patch of whitish/blue mold. All of a sudden, my husband said it moved inward. I thought he was a little crazy until i saw it myself. It goes completely inside the hole and looks like a worm. Like I said, a little creepy to me...lol