I’ve been using a Pax Bellum N18 for the past 6 months on a 40br with a 10g sump and although my Chaeto is growing great my No3 32ppm has not budged. Po4 is currently at 0.08ppm. I know it states not to use NoPoX or any other carbon dosing sources but would dosing with a No3 that high really hurt the Chaeto? At least until I gets it under 10ppm.