Kessil

Alex’s IM 150 EXT

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Assuming there's some small error built into your alk result, the PH probe, and the CO2 monitor - I'm not seeing any big mystery here?
 

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derek_SR said:
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Assuming there's some small error built into your alk result, the PH probe, and the CO2 monitor - I'm not seeing any big mystery here?
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This assumes alk of 7.7/7.8, which I only referenced from the ICP. You go down your matrix and select alk above 8 and assume I get CO2 down to 500 ppm, N/19, which I did for several days the week before, I should get 8.2, which I do not get with this tank.

I had alk above 9 (unintentionally) which did not move the needle at all, and potentially links to my issues where I have to dose high amounts of bicarb to reach normal alk levels (probably more than twice the normal amounts).
 
Where are your probes located, what brand are they, and how do you calibrate them? They can often drift significantly in just a week because both tanks appear to trend the same over the past day. Most hobby grade probes really are only good for trending and it looks like both have similar diurnal cycles of about 0.2 units.
 
Alexander1312 said:
This assumes alk of 7.7/7.8, which I only referenced from the ICP. You go down your matrix and select alk above 8 and assume I get CO2 down to 500 ppm, N/19, which I did for several days the week before, I should get 8.2, which I do not get with this tank.

I had alk above 9 (unintentionally) which did not move the needle at all, and potentially links to my issues where I have to dose high amounts of bicarb to reach normal alk levels (probably more than twice the normal amounts).
Click to expand...

All these values assume that tank CO2 levels are at equilibrium with ambient air. Personally, the first thing I would do is confirm that there is not a gas exchange deficiency in your larger tank before doing anything else.
 
RandyC said:
All these values assume that tank CO2 levels are at equilibrium with ambient air. Personally, the first thing I would do is confirm that there is not a gas exchange deficiency in your larger tank before doing anything else.
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@Alexander1312 I also have a large skimmer and a ton of surface agitation. It takes my tank several *days* of consistently low CO2 in the air for the PH to normalize at what I would expect to, based on the tables/science.

If your tank is indeed producing a lot of co2 (which I think is a perfectly reasonable assessment) it could potentially take your tank even longer for this equalization to happen. What I have noticed is that each sequential day the PH sort of inches up as the equalization "catches up" a bit each cycle - the peak gets a little higher and the valley gets a little higher. But one ugly day (my wife shuts all the windows) and it falls immediately.
 
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