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The one thing you didn't mention is your tank params? And also, how much is your skimmer producing?
It sounds like otherwise you are doing everything right. How long since you have completed your above regimen have you waited? I went through a horrible HA problem last year, and once I had everything in line, it took a few weeks for it to starve, and then it just started to melt away. I've had a couple small tufts come back, but I don't worry about them as long as they don't continue to grow or spread. Just part of the systems balance cycle.
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