You're welcome.
If I remember correctly the smallest jar of the Seachem Reef Advantage Magnesium costs about $8 or 9, and it lasts quite a long time as magnesium isn't used up very quickly, and most salts have adequate levels, so most people need to only dose very little if they do regular waterchanges. Oh, and you should never, ever, ever (did I say never?) dose for something unless you test for it.
