Diatom algea. This is very normal in a new tank, and unless you have
extra silicates in your replacement water it will go away. If you have
to much silicates in your replacement water you will have a diatom
outbrake at every water change, as well as normal growth just from the
top off water.

kim gross
http://www.jensalt.com

Gottcha wrote:
Can anyone tell me what this is and how to get rid of it. Its all over my
tank. Tank is about a month and a half old.

http://www.comp-connections.biz/tank/algea1.bmp