Here is my problem. I need to supplement my magnesium daily to keep the level above 1200, even though the concentration of kH and Ca remain relatively stable. Each day I am adding 25 ml of liquid magnesium supplement. The many experienced reefers in my local club are stumped. 30 gallon JBJ nano tank. Well established rocks and sand (2 years). mixture of LPS, few SPS, snails, and 3 small fish Nano calcium reactor, 2/3 calcium carbonate and 1/3 magnesium granulate Hydor slim skim Modest feeding every other day.