how long have you been running the Phosban Reactor and when was the last time you changed the media? It took my tank about 8 weeks and one media change to show improvement but once it started, the algae died back almost overnight. I also introduced a Purple Tang that has done an incredible job of cleaning all remnants on the rocks. I'd also try stepping up the water change schedule for a while. Try doing 10+ gallons per week for a couple months.
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