you can buy epsom salts in any grocery store, pharmacy,wal/Kmart...anywhere...1-2 tbs in res with water change for magnesium...

Do you use ROwater/distilled or tap/well water? If Ro/dist...then you need calcium and magnesium replenished in the water, as above process removes minerals,etc.

Just buy Botanicare Calmag+ and be done with it.lw under 20 bucks! Problem solved!