Well I think all the ugly brown stuff growing on my base rock and in my fuge is just a diatom bloom. Now the question is do i just let it run its course or is there some thing i can do. I have been told not to bother with cleaning the rock due to the fact that it will just grow right back. I have done a small water change. And got my lights on a timer. The tank has been set up for about one and a half to two months and this will be the first real problem I have seen. ( for any one who knows it turns out the clown fish dieing was not a problem with the tank and the LFS i got them from is taking care of the price of the fish for me). I have had 3 chromis in the tank for a little over a week and they seem to be doing fine. So all this is just to ask, is this a normal time to have this bloom or is it late in the cycle and means something is going go in the tank?