The only thing that has worked for me was to remove my sand bed and add an algae scrubber. Lights out, no water changes, peroxide dosing, siphoning my sand into a filter sock in my sump, and removing the top layer of my sand bed didn't work. It would knock them back, but they would be right back after a couple of weeks. Since removing my sand bed and adding an algae scrubber, I haven't seen any signs of them for almost two months now.
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