I've not found any correlation with low Mg and cyano bacteria growth, though Bryopsis loves low Mg. What type of hair algae is it? Derbesia or Bryopsis? I don't think PO4 is 27 ppm. Maybe 27 ppb which is 0.08 ppm? What are you using to test? What are you doing to lower PO4? Are you adding any bacteria products? What do you have for clean up crew and what size is your tank?
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~ Mindy
SPS fanatic.
Last edited by Myka; 08-25-2017 at 12:17 PM.
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