stump remover

I am trying KNO3 dosing (Spectracide stump remover) since my SPS colors are pale and my Nitrates were consistently 0 before dosing. I've only been doing it a few days, but my tank seems to consume about 2.5ppm/day. I have chaeto growing in the sump. Is the chaeto likely what's using most of the...

So this test will be conducted on a 14 gal biocube with a 10 gal Sump so roughly 20 gallons of water. My tank is SPS dominated Reef Octopus BH50 Skimmer Chemipure Elite Jeabao dosing 2 part from Reef Grow and Kents Tech M Magnesium I currently have 5 fish Pair of Oscellaris Clownfish Royal...