trying to understand alk & kalk

FlyinBryan

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I've been a huge advocate for kalk, once I started using I thought it made a huge impact on my tank, for a couple of years. Things looked great and were growing to a certain extent. Because I travel so much for my job, I let the testing slide, quite a bit.
I switched over to LED lights back in Sept and haven't seen the strong growth I generally like to see, especially from my zoa's.
I got a second wind of motivation the last couple of weeks for testing so I thought I'd check every 24 hours to see where I was at. I have a 29g biocube, and a 150.
The test over a 3 day period on the 29g went from alk 3.0dkh to 7dkh then back down to 4.25dkh, all within 36 hours. And I didn't do anything to the tank. Even the testing in the 150 is going through wild swings daily.
I don't have, IMO, overstocked tanks of corals. The 29g has a few sps growing slowly and zoa's that exist but are not growing, at all.
Like I said initially, I loved kalk, that I could just set the levels and kalk would help maintain in ATO! For the 29g I have like a 8 gallon reservoir and the 150 I have a 30 gallon bucket, both with max kalk for max saturation.
But swings like what I'm seeing are just crazy and can't be healthy for tank.
I'm testing using the Hannah checker, which by all accounts, the reagent is new, the batteries were recently replaced.
Does alk just evaporate? Should I just leave alk low and not worry about, switch out lights back to mh & t5's?
salinity is 1.025 and mg is 1350.
Thank you in advance.
 
Limewater may not keep up in many tanks, but the alk changes you are seeing sound more like testing error than actual changes. Even with no dosing, alk rarely drop to 3 dKH, and to jump to 7 means a 4dKH rise, which would take quite a lot of limewater (more than most folks evaporate)

What is your evaporation rate?

What kit are you using?

How are you making the limewater?
 
The Hannah digital and just once every 24 hours.

I forgot to mention that I did add alk to tank. Let it mix for an hour then retested which gave the jump.

I'm just really surprised how fast it dropped off in that amount of time while using kalk. I keep the house pretty humidified. And evap doesn't seem to be that much more than normal.
 
Well I think I might have figured out my problem. Maybe.
I started a new bottle of reagent and now my alk is measuring a whopping 10.41!!
I had just bought the hannah reagents, 2 of them at the same time.
Im not trying to throw anyone under the bus but come on! Thats a massive difference.
I mean I bought a whole dosing set up specifically to address this issue and now I really don't need it.
Sorry,I'm now venting.
Oh and yes, both reagents say they came from the exact same lot. Same expectation date 09/16 and all.
I've lost confidence now in this alk test kit.
 

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