Mag effects Cal and Alk. Get your mag level to 1300 to 1400 and you will see Cal and Alk rise. Here is a link to a great artical if you want to get in some reading. Good luck! "However, this method is unsuitable if the goal is to raise magnesium levels. The problem is that for every magnesium ion released from the dolomite, 2 units of alkalinity are also released: MgCO3 → Mg2+ + CO32- Consequently, if one wants to raise magnesium by 100 ppm, the alkalinity will necessarily rise by 8.2 meq/L (23 dKH). The only way around this problem is to add a mineral acid (not vinegar) to the aquarium to reduce the alkalinity, and that may be more problematic than just adding magnesium in the first place." http://www.advancedaquarist.com/2003/10/chemistry Sent from my SM-G920V using Tapatalk