Myteemouse;4400039; said:MAG, CAL, ALK, is all you need to ad.
And yes MAG is VERY important.
Old salty dog taught me,
IF YOU DON'T TEST FOR IT, DON'T ADD IT!
^^^ Agreed on all counts. That being said some people test for strontium and iodine, but if you can get measurable readings of those then you have to much haha.