hey all, ive had some red/brown spots showing up on my sand, lately its gotten a little worse and I don't really feed a whole lot. I got a test done at my lfs last week and everything was zero, (except nitrate which was like 5ppm or w.e) which can obviously be a problem. ive started to feed on a schedule, dosed chemi clean which didn't do anything and recently reupped on my clean up crew which also doesn't seem to have helped, other than weekly water changes is there anything I should do? and is there any way anyone can ID what it is??
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![20221202_132322.jpg 20221202_132322.jpg](https://test.reef2reef.com/data/attachments/2856/2856923-7a554163ba85bd1faafad93c8ef48226.jpg)