I thought the CA level in natural sea water was about 420ppm. My CA level is always lower than 420ppm that's the reason I want to raise it. That and most publications I've read suggest CA levels between 400 & 450 for good coral growth. Here are my test results taken moments ago including Mg.
Ammo, Nitrite, & Nitrate = 0
PO4 is less than 0.03
CA = 380
KH/Alk = 4.7 ml, 8.4 DKH, 3.06 meq/L
Salinity = 1.025
PH = 8.0
Temp = 77.9
Mg = 10.80
Time = 3:38 pm, est.
API master test kit is used for Ammo, Nitrite, Nitrate and PH. Salifert for the remainders.
Test tubes are always cleaned before and after use.
RO/DI water is used (Kent Marine Mexxima 60) and membranes are about 1 month old.
I use a Aqua C EV 180 skimmer and I also have a fluval 305 which is loaded with Purigen, RowaPhose, and Chemi-pure, all of which have not reached their expiration dates.
I have about 200 pounds of LR and another 50-60 pounds of LS in a 120g tank.
There is also a 40g sump/fuge which has some LR, LS, a small piece of Chaeto and a small Mangrove.
Lastly, I perform a 15% water change weekly and the last was performed this past Sunday.
Did I leave anything out?
Any advice or suggestions?