So I run my SPS dominant reef at 8.5 alk. I was testing daily with a Hannah but it's been stable so I have started to test less frequently. Dosing 145 ml alk and cal on a 150g daily. 2 weeks went by and I ran a test on alk and got a reading of 6.7. Whoa. Ran a few more Hannah tests and got the same resultsg. With 2 clams and a bunch of sps I figured this could be possible. So I started bringing it back up to 8.5 over the course of a few days. When I tested yesterday it was only at 7.5. With the brs calculator, I knew this could not be right. So I opened up a new reagent ran a few Hannah tests and ran a few Salifert tests. All came back right around 10.4.
It appears that the Hannah reagent that was open for about a month was giving me a low reading. Has anyone else had this issue with reagent going bad after a month? I am going to let the alk come back down slowly over the next few days and hope there was not too much stress caused.
It appears that the Hannah reagent that was open for about a month was giving me a low reading. Has anyone else had this issue with reagent going bad after a month? I am going to let the alk come back down slowly over the next few days and hope there was not too much stress caused.