[jsgates]

I have looked at the reef calculator, and really like the flash version of it. Great tool! I have also read the calcium portions of the other article you posted. The thing I am having trouble understanding here is the alkalinity reading. According to my Seachem test kit (my only reference when testing), the alkalinity should be maintained between 4 & 6 in an aquarium. That I why I was concerned with a reading of 6.5. PH is 8.3 which is fine. Isn't high alkalinity outside of a certain range bad. I'm just kind of nervous dosing CA right now and watching my levels...........don't want to make any mistakes and harm my fish......which are doing quite well.