Trouble Increasing CO2 with Injector - The Planted Tank Forum
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post #1 of 3 (permalink) Old 10-09-2014, 01:00 AM Thread Starter
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Trouble Increasing CO2 with Injector

I got a submersible CO2 injector for my 29 gal aquarium. The instructions are to measure kH and pH and find the ideal CO2 level using a chart like this one:

I am supposed to start the injector gauge on low and increase it slowly day after day until the level is in the sweet spot.

The trouble is, I have increased it to the maximum, and my kH nor pH levels haven't changed a bit! The kH has remained constant around 6, and the pH around 7.4.

The injector has been in place maybe 6 weeks.

Should I start adding pH down chemicals to get the chart in the right place?

I have some sinking driftwood in the aquarium. I don't remember the name. Would that change my pH?
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post #2 of 3 (permalink) Old 10-09-2014, 01:50 AM
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Kh is not going to be affected by the C02 only PH.

What do you mean injector? Are you saying pressurized C02? Do you have a link to this product?

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post #3 of 3 (permalink) Old 10-09-2014, 02:00 AM
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Also beware of using pH/KH of tank water to try to determine CO2 levels using that chart. That method only works correctly if the only buffers in the water are carbonate/bicarbonate based.

Water with phosphate buffers (for example) in it is very resistant to pH change, and the pH will drop considerably less when CO2 is injected.

If you want to know your CO2 level, use a drop checker with a 4dKH solution, or solution of baking soda & distilled water. It isn't perfect, but it is substantially more accurate than tank pH changes.
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