Manual dosing vitamin c, it's by weight from the huge vitamin c thread on one of the reef sites. Split into 2 doses. I've been adding 2ml of red Sea all buffer twice a day for almost a week. Using no3po4x at .5 ml daily. Microbacter7 one drop daily. Last I checked alk it was 5.9 dkh, that was before dosing. Will check again tonight. Use reef crystals from a local store at 1.025 salinity. Fresh salt from them is about 7.2-7.6 dkh. My tank parameters as follows from last week. Nitrite 0, nitrate about 12, ammonia 0, po4 about .12, cal 440, mag 1480, alk 5.9. I'm using Dan's reef v7 adjusted down a bit for light schedule on two ai primeHD lights with a 50 acclimation for 3 months