Ok. Lemme esplain'......
Back in July I left for a week of vacation. Up until that time tank was on cruise. I had a legit growth spurt. I got back from vacation and tank looks great, grew like crazy. I check my Alk and it was like 2 dkh lower. I figure I was gone a week without testing, maybe I missed something. So I proceed to up my dosing. Tank keeps doing great I'm thinking I'm in for a growth explosion. Alk keeps dropping and I keep increasing the dosers. Things start looking weird out of the blue and my Alk is a little elevated so I figure I pushed it too far and back off. Things start to get better over a few weeks and my Alk starts to drop so I go back to increasing to what I had backed off. A few more weeks go by then all of a sudden things start looking bad again. All parameters look great. Tank starts looking bad and some pieces are looking terrible, and I'm thinking here comes another unexplained funk. I start checking Alk every day to really keep a pulse on it. All this time it's been rock steady. It can't be Alk right? I run out of reagent and on the very first test, bam Alk is through the roof! This can't be right?? This new reagent must be bad. It was my last bottle but I just don't trust it.
I go to all pets and buy a Red Sea kit to see if I can make sense of this. Red Sea kit agrees with new reagent! Oh crap, the last reagent was bad and the new one is good. So I get my Alk back down things start to look better and now Alk starts to drop again. Ok, makes sense now I'm getting back to where's I was. WRONG!!!!! This bottle was bad as well. I had by that time ordered more reagent and when I ran out of the one that agreed with Red Sea kit the new reagent read Alk through the roof again! I'm talking from one day to another. I test every day to every other day when things are not going perfect. You don't get a drop of 2dkh in one day out of the blue.
The problem is all this time the readings were consistent. It's so gradual you hardly notice it.
At this point I researched this and apparently this has happened to a few really experienced reefers.
I called Hanna this week and they told me they've gotten a few calls about this very issue. They asked me the lot number of the reagent that was bad and it matched the lot number of another customer that called complaining of the same issue. I basically went through 3-4 bottles of this bad stuff and I was creating a roller coaster of Alk swings (gradual but significant) and all the while I'm thinking my Alk is rock steady.
This is where's the Salifert comes into play. I'm going back to Salifert for the moment because the way the sptest is done it lends itself to being more accurate then the checker. My plan is to eventually go back to the checker but I'll likely spot check with the Salifert from now on. If you research the Hanna Alk Checher you'll see some people complain of drifting readings as you near the end f the bottle.
I've been using the checker for a couple of years and every time I open a new bottle, it's always agreed with the last. The last 3 bottles I went through the new bottle read way higher than where I thought my tank was.
So there. I not crazy, I'm not overly anal. I am glad that I know now what is going on. If I'm being honest, this is exactly what happened when I had my unexplained funk. Same corals looked the same exact way. I thought it was a nitrate issue, now I'm doubting that.
You understand now viejo?