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I recently ordered some of this and was wondering how much to dose on my tank. I am using it to increase hardness of water since snails are showing signs of not enough in the water for their shells. Tank is a 75gal
 

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Snail's shell is made by food, not by water calcium content. But if you want to make your plants happy get 20 to 30 ppm of Ca by CaSO4. Good choice.
 
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