Small "Bugs" In My Aquarium?

Since I have a very small vocabulary, I don't have a better word for these things. They almost look like little insects, and I have no idea what they are hanging out on. Maybe a little bit of sponge?

Anyone have any idea what these are? If it's any help, there were a few tiny shrimp nearby. Not sure what they were. Maybe krill? They are very small and completely white.

 

The normal Zooplankton, copepods, amphipods, isopods.......

http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml

I am surprised I did not give you this link yet.

 

No, I think you did. I just couldn't tell what they were looking at that list. Kind of hard to tell, I guess. That sponge you saw in another thread is definitely spreading slowly. White in some places, gray in other places, purple in other places. Kind of cool looking. And tons of brittle stars growing in them, oddly enough.

Thanks again for the help.