Why is my Mg always so low?

[whatcaneyedo]

Someone said that they were able to get their city's Home Hardware to special order them a bag of Mag Flake. If that doesnt work for you, you can buy pharmaceutical grade magnesium chloride hexahydrate (spelling?) from Bulk Reef Supply or chemmaster (who's is already mixed with magnesium sulfate). I personally use a non-pharmaceutical grade ice melting salt called Absolute Zero Melt Down which is 100% magnesium chloride hexahydrate(?). So far I have not had any problems with it *knock on wood* and it only costs $25 for a 30 lbs bag.