Tyler - After using the SERA Alkalinity test kits for a month, I'm not so sure about it's accuracy. The last two weeks it indicated my alkalinity was dropping. When I tested this weekend (tested twice), the results said my dkH had dropped to 7. Since optimal is supposed to be 8 - 12, I increased my addition rate of akalinity additive (Part 1). Three days later, three of the Acros that I bought from Luis started bleaching. So I pulled out my two older Seachem test kits and got 5 mg/L with one of them and 6.5 mg/L with the other. Since I got three totally different results from three separate kits, I decided the stressed corals were a better indicator than a test kit. I resumed my previous addition rate of the Part 1 additive, but now I have three dead corals that a week ago were beautiful and thriving. Very aggravating!
Mark