Calc 400, Alk 90ppm, ph8.2

[PoonTang]

Plain ol baking soda. It will actually lower your PH a little temporarily. Just add it slowly. You can use this calculator to tell you how much to use.
http://reef.diesyst.com/flashcalc/flashcalc.html

[Cameron]

I used a better test kit and estimated my alk at 9.6, calc at 460, and ph around 8.1 i think.