brown top coating starting on tank sand

Nimboli12

Reefee
Ok , a few minutes ago I noticed a top coating of brown substance on surface of the sand in my tank. There is also alot of green algae on back wall. I just cleaned it yesterday. What is causing this brownish tint? I just put my new soft corals in 2 dys ago. Everything was looking so nice and now this.:shock:
 
Could be diatoms.
How long has the tank been set up? what are the actual numbers for your parameters?
 
Well I just did a water check. My nitrites are .50. Thats a first for me. My tank's been up for 5 months. Ive not seen diatoms in there ever. Im doinf a water change asap.
 
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