Swinging white things on aquarium glass, what is it?

[sandofarms]

Swinging white things on aquarium glass, what is it?
About 2mm in size, easily visible to naked eye.

http://www.youtube.com/watch?v=al_pUDrCS6M
http://www.youtube.com/watch?feature=endscreen&NR=1&v=YAj3xyrtfq0

And how do I annihilate them and blast them to the great beyond?

 

[joe jaskot]

Possible hydra.

 

[Runitis]

I'm pretty sure its nothing to worry about. I forget what someone told me but it grows on driftwood and ornaments. Just rub it off with an algea scraper you just have to clean the glass every once in a while.

I need to spark up my fish life