Brown algae on new setup

[electricd7]

Hello,

I just setup a 46Gal tank about 2 weeks ago. It is 75lbs of sand (10lbs of live), 15lbs of live rock and about 100lbs of base rock. I have 4x96W power compact bulbs on it (1 Actinic 12hours per day, 3 10k on for 8hours.) In the last 3 days I have noticed a brown aglae growing on the surfaces of rocks and sand. Can anyone tell me what this is, and what I can do about it? Thanks!

ED7

http://media.wthitv.com/chad/pict0083.jpg

http://media.wthitv.com/chad/pict0084.jpg

[staticx]

Welcome to diatoms, nothing to worry about they will go away

[Lizz85]

I agree. Those are diatoms, are common in new tanks, and will go away one day almost as quickly as they appeared.

[loves saltwater]

Did you set up your tank with tap water or ro/di ? Diatoms will come and go.I have a small problem with them now and my tank is 3 months old...