2 part dosing

[burgerchow]

Anybody using 2 part calcium dosing?

I'm using 2little fishes A and B calcium. Been using it for almost 3 months, but my tank parameters still not high enough. Last test was yesterday, done J&L,

calcium 300
magnesium 800
alkalinity around 8

I had issue with low magnesium last month. Added Seachem mag buffer and brought it back up to around 1200, but it's dropped down again.
I've been dosing 30 ml of part A and B everyday. Maybe not enough?

Tank is 120 display, 140 lbs live rock. 50 gallon sump, various sps and lps