ID dust bunnies/algae/aliens?

[Raidendex]

Any idea what is this? Seem to be in the area with high flow from powerheads. Comes off pretty easy. If i rub it between fingers there's no texture just falls apart into dirt it seems.

Pictures
http://pets.bloodrogue.com/image/reef/misc/dirt/Picture 1077.jpg
http://pets.bloodrogue.com/image/reef/misc/dirt/Picture 1078.jpg
http://pets.bloodrogue.com/image/reef/misc/dirt/Picture 1079.jpg

Video
http://pets.bloodrogue.com/image/reef/misc/dirt/index2.html