found magnesium chloride

How much of this magnesium anhydrous vs the hexahydrate would I need to mix in with Epson salt to stay within randys improved 2 part 5:3 ratio? I found other post from 2 years ago on another forum about this nedmag I guess it will be ok.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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