Test results update...
Ca 350ppm (Down 100ppm in 12 days.)
Alk 8.5dKH (Down 0.7dKH in 8 days.)
Mg out of reageant, oops
PO4 0.26ppm (Down 0.38ppm in 12 days, likely a spike from killing the cyano last time. Chaeto is growing like crazy.)
Salinity 1.026SG
I went ahead and dosed Ca back up. It took 500ml to raise my tank from 350 to 400ppm. I dosed 300ml at first, waited a few hours and tested 380ppm, an increase of 30ppm. Dosed 200ml a second time, waited a hour or two and tested 400ppm, an increase of 20ppm. So for my tank, 500ml per 50ppm or 10 ml per 1ppm. I have 100 gallons of water almost exactly according to the BRS calculator. I'll dose another 250ml before work to get it up to 425ppm where my goal is. I did test alk again after dosing the BRS Calcium Chloride because I remember reading dosing one can lower the other. Still 8.5dKH.
Figuring out calcium consumption should be easy. I dropped 100ppm in 12 days, that would be approximately 8ppm a day or 80ml of liquid calcium chloride.
Alk consumption was 0.7 dKH over 8 days or .08dKH a day. Using the 100g on the calculator, it tells me to dose 5ml a day of liquid soda ash. I wonder why the alk dose is so much less than my calcium dose? Perhaps once I get calcium stable, alk consumption will increase.
For now my doser is set up to dose 13ml of calcium chloride 1200, 1400, 1600, 1800, 2000 and 2200. Soda ash is 30 minutes behind at 1ml. I'll monitor closely and adjust as needed until the tank is dialed in. With all the frags I've added recently, I'm expecting to adjust a bunch.