Bradttu - after calm reflection on your pictures I've concluded that there is one other possibility. They could be Munnid Isopods. From the pics the appear to be Copepods, but I really need details of size, movement, and visible antenna/legs to know for sure.
These Isopods are the bug of the week in the Reef Forum if you want to take a look and see if they're similar.
IMO Munnidae are even more beneficial then Copepods.