Was wondering if the brown algae growing on my scrubber screen is diatoms or something else. Heres why. I have been scrubber only on my 125 for 4 months now. I have never had an algae problem in DT only cyano (which was cleared in 3 days with scrubber). I started tank with 99% marcos rock. So I never had a variety of algaes in my tank. Right now Im getting A diatom bloom on my sand. Im assuming my silicates are high because I have no detectable nitrates and .01 phospahates (on hanna meter). Anyway What I have noticed is my scrubber will grow whatever im battling with at the time FIRST on the screens. EX: I grew alot of cyano at first. Then slowly I start to grow Greener algae on top of that Effectively killing of the first layer of growth. I have been cleaning every 7 days because i want the best scrubbing possible with the greener algae. So if the brown algae is diatoms should I be cleaning the screen every 3 days to remove the nutrients such as silicates from my tank? Or let the green come in?