Cal, Alk, Mg in established systems

[Myka]

I figure it might be interesting to compare how much each of us are dosing in some more established reef tanks.

In my 90 gallon reef (+15 gallons in sump) I dose calcium and alkalinity. Magnesium is kept steady around 1375 ppm with weekly 10% water changes with saltwater containing 1400 ppm Mg. The tank is 2 1/2 years old and about 70% SPS (by area).

Calcium math:
3000mL RO/DI
270 grams Fauna Marin Calcium chloride
134.4 mL mix dosed per day
12.1 grams Calcium chloride dosed per day
0.115 grams Calcium chloride dosed per gallon of tank water per day



Alkalinity math:
3000mL RO/DI
300 grams Fauna Marin Sodium bicarbonate
192 mL mix dosed per day
19.2 grams Sodium bicarbonate dosed per day
0.183 grams Sodium bicarbonate per gallon of tank water per day