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I have a 72 bow salt. Been set up for about 4-5 weeks. I am starting to get a brown color on the live sand, i think diatons. Also starting to get a red algae, a little stringy on 1 of the live rocks, and a few blotchy spots on the sand also. What can i do to stop this?I read to turn my light off but im afraid i will kill the small group of polyps, and mushrooms that are in there. My tank consists of live sand,50-60pds of live rock, protien skimmer,2powerheads,heater,salinity 1.023, all water levels are where they should be. 1 double bar rabbitfish, 2 mated pair false clowns, 1 gobe, 4 snails (unsure of what kind.) I dont over feed. I have a regular strip light on the tank now with an ocean sun 10k bulb. I have a t5 but am not going to put it on until the problem clears up because i dont want it to grow. I am new to salt water and any help would be appreciated. Also.. I did use RO water to fill the tank. Thanks in advance.