I've also been hit hard with Cyano and was trying to lower my nutrients to get rid of it. My nitrates are at zero now, however the phosphate levels are still high.
I plan on using chemiclean to get rid of Cyano and then change up the media quantity of GFO (I think I was very conservative with GFO media I used initially).
I'll keep you posted on my success and faliure as I progress!!
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