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Old 01/15/2017, 04:11 PM   #13
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Join Date: May 2004
Location: Dallas, TX
Posts: 10,903
Datapoint. I was curing ~100lbs of concrete in my tank (before life).

The starting pH was 11
I turned on my very large skimmer
pH dropped to 9 very quickly and then stabilized to 8 within a few hours.

This was in ~500gal of tap water.

I kept this up for a couple of weeks - pH never went above 8.3. I would occasionally turn the skimmer off to test the "curing"

math problem: how much CO2 does it take to do that and how is it that this abundance of CO2 is not available to algae?

My conclusion - as quickly as the algae (or in my case concrete) consumes CO2, it is replenished - the state it is in CO2, carbonate or bicarbonate doesn't matter.

Failure isn't an option It's a requirement. 660g 380inwall+280smp/surge S/L/Soft/Maxima/RBTA/Clown/Chromis/Anthias/Tang/Mandarin/Jawfish/Goby/Wrasse/D'back. DIY 12' Skimmer ActuatedSurge ConcreteScape

Last edited by karimwassef; 01/15/2017 at 04:45 PM.
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