Strange Alk Trends

[Hubtech]

Whatup reefers?! I have a weird one. The tank in question is a 210g with a Emerald 34 sump. I currently have a lm avast kalk stirrer fed by a kamoer peristaltic dosing 1ml/m, and a calcium reactor running 40ml/m by a kamoer peristaltic pushing about a bubble every 2 seconds managed by the carbon doser.
I track my KH with a KHG. Over the last few weeks I’ve noticed from lights out to morning my alk actuall drops from 8.3ish down to 8.06-8.08 almost every night. I might be crazy, but how in the world is all being consumed sooooo much at night when lights are out?
I’ve attached a read out from my KHG. I also calibrate the KHG monthly.

 

[Randy Holmes-Farley Verified Community Expert]

I don't understand the dosing. Is the KHG controlling dosing? Or is it even 24/7?

 

[Hubtech]

@Randy Holmes-Farley

I’ve not enabled any dosing through the KHG as of yet. The KHG tests every 4 hours.


I have two Kamoer FX-STP pumps dosing 24/7. One is connected to the calcium reactor at a rate of 40ml/m and the other is connected to my kalk stirrer at a rate of 1ml/m.

 

[Randy Holmes-Farley Verified Community Expert]

The pH reported is in tank? It is very low, if so and if it is accurate.

The alk changes are pretty small. It might even just be reflecting noise in testing.

 

[Hubtech]

The pH reported is in tank? It is very low, if so and if it is accurate.

The alk changes are pretty small. It might even just be reflecting noise in testing.

No the ph is not tank ph. Tank runs from 8.05-8.15 daily.

 

[alex77619]

The pH reported is in tank? It is very low, if so and if it is accurate.

The alk changes are pretty small. It might even just be reflecting noise in testing.

KHG ph will read lower due to the KHG ph probe was calibrated using PH 4 & 7.

 

[Randy Holmes-Farley Verified Community Expert]

KHG ph will read lower due to the KHG ph probe was calibrated using PH 4 & 7.

Do you mean it is calibrated to read correctly at lower pH levels (may be true), or are you suggesting the actual reading n tank water will be lower because of how you calibrated it (not necessarily true)?