Rising CO2? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 05-09-2011, 02:59 PM Thread Starter
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Rising CO2?

...we've been testing pH levels 3x a day, and KH 1x a day. In order to keep CO2 levels in the ideal 15-40 ppm, it's been necessary to hold a bubble-rate between 1 and 2 bps; however, over the past several days, CO2 levels have been on the rise; therefore, the bubble rate has been reduced significantly <20 bpm, yet pH is still holding at 6.0.

Why is this?

All the plants are a deep green, even apongeton ulvaceus. Do plants use more CO2 if they lack color?

...it's about the fish.
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Last edited by Stevenicoloconnor; 05-09-2011 at 06:04 PM. Reason: ...more detail.
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post #2 of 6 (permalink) Old 05-09-2011, 07:26 PM
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How are you determining how much CO2 is in the water? What is the KH doing as the pH is dropping, or is it dropping?

Hoppy
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post #3 of 6 (permalink) Old 05-09-2011, 10:18 PM Thread Starter
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Originally Posted by Hoppy View Post
How are you determining how much CO2 is in the water? What is the KH doing as the pH is dropping, or is it dropping?

...the KH gradually increases from 3.0 to 4.0 in 3 to 5 days after a 50-60% water change; so, CO2 is always on the increase: right? The bubble-rate is determined by counting how many bubbles in 10 seconds and multiplying by 6; then, cross-checked by counting how many bubbles in a minute.

The pH test kit we use does not measure pH < 6.0; so, maybe our tank pH is less than 6?

...it's about the fish.
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Last edited by Stevenicoloconnor; 05-09-2011 at 10:25 PM. Reason: More info.
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post #4 of 6 (permalink) Old 05-09-2011, 10:38 PM
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You need a drop checker. The drop checker will hold a control solution of 4dkh ~7ph. This will give a better reading than reading the tank water which can vary in chemistry due to driftwood or rocks or substrate or whatever.


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post #5 of 6 (permalink) Old 05-09-2011, 11:19 PM Thread Starter
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Originally Posted by mistergreen View Post
You need a drop checker. The drop checker will hold a control solution of 4dkh ~7ph. This will give a better reading than reading the tank water which can vary in chemistry due to driftwood or rocks or substrate or whatever.
...didn't want to add anymore equipment to the aquarium, but if I can't find a low-tech way to our satisfaction, I suppose I get to buy another goodie!

...it's about the fish.
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post #6 of 6 (permalink) Old 05-10-2011, 12:59 AM
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A rising KH is usually because carbonates are leaching out of rocks or substrate. A rising KH does not mean a rising amount of CO2 in the water. If you get a drop checker it will guide you to a bubble rate that is somewhat near what you should use. Then, adjusting the bubble rate a very small amount every day or two, watching for fish distress, should get you to the concentration you should have. (for high light tanks.)

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