I woke up the other day with brown spots in two of the corners in my FOWLR tank. At first I thought it was just some dirt in the sand and would dissipate over time. But now it is starting to spread. I did a little research and I think it is brown algae (diatoms). I don't really know how to get rid of it without harming the other algae in the tank. I'm on day 10 of a start up, salinity is 8.0, ph, ammonia, nitrites and nitrates are 0. I got really eager and put 2 yellow tail damsels in it. They are doing fine. I don't know how to download photos or I would send a picture. Working on that though. Please help or am I just being paranoid.