Quote Originally Posted by MizTanks View Post
Reef Crystals. 1 cup per 2 gallons give me an sg of 1.030 a ph of 8.4 and an cal level of 460. Am I maybe not changing enough of the water to raise my levels? Leaving to much of the old water in the tank? I thought a kh level between 10-12 was ok, no?
Ca and alk influence each other. If one is high the other is low. 10-12 alk is fine but you will have a tough time getting Ca levels up. I'm not familiar with the product you're using but are you sure that you're dosing more of the Ca part and not more on the alk part?

Here's a link to some info and a dosing calculator to help with Ca/alk balance: http://reef.diesyst.com/flashcalc/flashcalc.html

and another on a DIY two part system that many people (myself included) use: http://reefkeeping.com/issues/2006-02/rhf/index.php

HTH,
Tom