Nitrates are not detectable using the Nyos kit. Alk is ~8 using the Hanna photometer. Calcium is ~450 using Salifert. SG is 1.026 via refractometer. That's all I text for. I dose BRS two part via dosing pumps from @AVAST Marine and love them. Just ordered the Apex wi-fi today from LFS when I picked up a beautiful 2" Tomini tang.