NO3:PO4

[DKoKoMan]

Could be the change in nitrates (being reduced quickly). My tank is about to it 2 months after the transfer, I used all new sand and added some cured LR. I’m currently dealing with cyano myself, it’s on the sandbed and on the rocks trying to cover corals :angry:

As far as NOPOx goes, I used it in my overstocked 150g and it was a beast in nitrate reduction. The only negative was bacteria clumps in my sump (looked like a yellow/brown slime). I would use a turkey baster and suck it out.