What are these tiny creatures on my glass?

[Mr31415]

I have hundreds of these tiny creatures. I'd say they are about 0.3 - 0.8mm in diameter. Here are some shots at 1x to 5x magnification on a 21MP camera body (for judging size):

5x (cropped)
http://www.waldonell.com/images/_53W7367.jpg

5x (cropped)
http://www.waldonell.com/images/_53W7368.jpg

1x (cropped)
http://www.waldonell.com/images/_53W7370.jpg

[gnashty]

hydroids?

[lvpd186]

Cladonema jellyfish: http://http://www.melevsreef.com/id/jelly.html (http://www.melevsreef.com/id/jelly.html)

[Mr31415]

Thanks. Here are two better photos just for the archives:

Front lighting
http://www.waldonell.com/images/_53W7376.jpg

Back lighting
http://www.waldonell.com/images/_53W7377.jpg

[graysmurf]

Those things look like they are out of the matrix movie

[Mr31415]

Squiddies... yeah they are freaky when seeing up close. I wiped my glass clean of algae and within 20 minutes they all were back on the glass panel. Quite amazing.