Actually Nikki it doesnt work that way. I used the epson salt because it was really cheap, lol. you can use it but dont use to much as for every bit of magnesium you put in you also put in Sulfate. With the ammount of water I have it would have cost hundreds of dollars to raise it. So I cheaped out. If you can use the mag cloride it is better, but a bit of the epson wont hurt you to much.
Mike