i just wanted to raise my cal up for when i get my sps and clams. I might be getting them this weekend or next. I'm not sure though how to balance it. Can i just test every day for about a week and then see how much it goes down every day and add just enough to keep it at that amount. On the back of the calcium supplements, u know the amount they tell u too put in your tank, is that just the amount to maintain it. thats what i've read somewhere.