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Is it just on your back wall or anywhere else in the tank? If you were to take a razor blade and scrape off a section, would it break apart, come off as a single mat, or come off in chunks?
It looks a lot like some stuff I had growing on my back walls. I never took a sample and looked at it though. At this same time I was and still am dealing with Dinoflagellates. My nutrient levels had bottomed out and this stuff, whatever it was, was still growing well. After I scraped it clean, it hasn’t come back like it was. Here’s a pic of what I had. And another pic of my beautiful sand bed.:mad: