pH probe

Maybe this is more common knowledge than I think, but I thought I'd share this info in case someone else has the same problem.

My pH has been rock steady for months at 8.22-8.34 with constant monitoring using my Pinpoint pH monitor. Then a few days ago it started climbing slowly everyday to 8.4 then 8.45 then 8.49...and I got worried.

First I blamed it on starting to use a 2 part calcium supplement (because the change started the next day.) I stopped using it.....the pH climbed.
Then, I did a big water change--a slight drop to 8.45 then the next day back up to a high of 8.5

Next I decided to clean the pH probe in some vinegar overnight....guess what? No change. pH now 8.52. Now I'm getting worried. Fortunately, all the livestock looked fine. So, I decided to get more drastic but thought I should be cautious just in case. So I added some vinegar but only 50% of dose calculated to lower pH by 0.3 Ahhhhh, the pH slowly dropped to 8.4. I went to bed happy thinking the next day would be a better day for acid/base status. Wrong....the ph was up again.

Because the livestock continued to look good I decided there had to be something else wrong. I checked with 2 different colorometric tests that showed pH to be around 8.3. What was up?

Then I figured it out! Do you know what was wrong? I'll give you a chance to guess before I give you the answer, but I felt like an idiot. :?

Glad I trusted my instincts and the look of the tank's health before I did something so drastic that I screwed it up and lost livestock.
 
You replaced the battery and got a true reading again? :idea:
 
I don't what was up, but I would have certainly calibrated the Ph probe to see if it was getting a true reading before I would changed anything in the tank.
 
Yes, you've got it right. It was the battery. After all that, I happened to notice the "LO BAT" message was blinking. I installed a new 9v battery and it was amazing. My pH was instantly corrected! Don't let this scare happen to you. I felt so dumb! :roll:
 
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