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You are at the point now where you need to let nutrients do it's own thing. However, I would maintain 2ppm of no3 for the duration of the hair algae. As far as the hair algae goes, you need to manually remove it with water changes. I use a ridged air line hose as a siphon and use a pinch pull method to remove the algae. This limits water reduction and maximizes gha removal. Also, it doesn't matter what rate of removal you choose. You can do weekly or every other day if you choose.Ok guys long overdue update. I have been maintaining a .07PPM P04 level but having a hard time keeping my NO3 above 0PPM. I now have Green hair algae all over my tank. It appears the chrysophytes/dinos have been taken care of. How do I deal with the hair algae? Is this likely due to my NO3 being at zero?