I have a 20 gallon long with amazonia topped with controsoil. It also has pool filter sand, seiryu stones, and manzanita drift wood. I am injecting CO2 to where my indicator stays yellow green. I am using the fluval co2 indicator solution.

I am using API testers.

Here are my parameters: 4 days after WC and during peak CO2 injection time.
Ph: 6.6
Kh: 9 dKH
Gh: 16-17 dGH

Here is my tap water:
Ph 7.6
Kh 6dkh
Gh 7dgh

I will do more testing at different times like right after water change, before water change, during peak, and off peak co2 injection times.


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