M007
Acro Whore
I had a few issues with the tank recently. First I have been monitoring my Alk every day or two and about two weeks ago, I noticed that the alk was trending down so I just upped my Ca reactor a little to compensate, next day it looked good, but then it started to go down again so I made another adjustment but still next day it was down again. So at that point I pulled out a different test kit (I had been using the Hanna Digital Alk kit), my trusty Salifert. The Salifert Alk kit measured 9.3 dKh, much higher than the 6.5 the Hanna was telling me! So then I use the calibration fluid that is included in the Salifert on both the Salifert and the Hanna. The Salifert is spot on, the Hanna is way off. At this point I shut off the reactor for afew days and go with the Salifert as the correct reading. But the damage was done and I burned a few frags, including the pearlberry and a nice Red Dragon frag that I had. So I lost them.
Reading up on the Hanna accuracy later I found out that the titration fluid becomes less accurate as you near the end of the bottle, my bottle was almost done. I had another unopened titration bottle that I bought, so I pulled that out and the numbers then matched up against the Salifert exactly. Now I am a little leery of using the Hanna knowing that it can drift drastically at some point.
I had exactly the same thing happen last week. The tell tale sign that the reagent is off is floating residue in the reagent. I normally come in at 130, last week the egg showed 115 so I opened a new bottle and got 130.