I was told here that I should cut back on the lighting (amount of time it is on), and to not overfeed the fish I had in there. It's hard to not feed them too much...specially if your new to this. How do you know how much to feed?
I started backing off on the food by just feeding very small increaments that I can watch the fish eat. If they didn't eat all of it when I fed them then I would not put as much in the next time. I ended up feeding them only what they could eat at the time. This way you don't have all the wasted food collecting on the substrate.
I backed off the lighting by half and that seemed to help some.
The best thing I did was get a ton of snails, I have 125 gallon tank so it took quite a few. I still stayed under the recommended snail per gallon that the LFS
And, of course this is part of the cycling process as I have found out. I was told here by the people in the forums that a new algea will grow to fight the brown algea, and so on,and so on.
My brown algea is gone, it took a good month and a half to get rid of it. I also think that quality lighting does has an effect on algea growth, I could be wrong.
This being a new tank expect more of the same. Everyone here has gone through the same thing, and evryone who comes after you will too. Welcome to the wonderful world of Saltwater.......
Hope this helps out. If I missed anything I am sure some others will jump in and help out.
125 Gal-35 Gal Wet/Dry-Tetra-Tec PF500 HOB
(3) AuquaClear 301 Powerheads-600 GPH
Automatic Tempature Controller
5-6 Inch Sand Bed-200+ lbs of LR