That is certainly just the diatom's. Pretty common. My tank has a CUC that keep mine in check. No problems..it won't kill your fish. Tons of ways to get rid of it, just search on the site..and see what works for you.
I agree its pretty common with new tanks - My new 75g was set up 4 weeks ago, the last two days the brown algae is spreading like wildfire, rocks, plants, decorations, glass - it's getting out of hand quickly. Time to fight back.
well i did check everything and the only thing th at is high is my nitrates by a little. I went out and bought this algone product to get rid of this problem i been doing 30% water changes constantly. Does this effect my LR at all it already looks like no life on it so far