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How to Tell if Your Organics Levels are High The tell tale signs of high organics in marine aquariums include (1) Persistent hair algae problems despite low nutrient levels, (2) Some foaming in the sump or in the corners of the tank, (3) An oily film or cloudy layer on the water surface where even a tank overflow cant seem to get rid of all of it, and (4) small growths of Cyanobacteria spotting on rocks and the gravel. Read: For those of you that have persistent hair algae problems even with low nitrates phosphates and using ro/di water, this could be the reason. I'm currently facing the same issue, will verify if running carbon does eliminate my hair algae in a couple of weeks

market prawn will kick start the cycling. If you don't use market prawn, some people use starter fish, which i strongly disagree.