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post #1 of 4 (permalink) Old 05-03-2008, 04:16 PM Thread Starter
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Question question...

Hello everyone!

I have a 60 liter tank with 48 watt lighting system.

My substrate is Aqua soil amazonia i have an external filter eheim ecco 2232 and i have a pressurized CO2 system.

And my question is..
My tapwater has a pH of 7,54 and a kH of 11.
How much CO2 should i insert in my tank since i have a ph controller. In other words what pH should i shoot for so my plants can grow healthy?
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post #2 of 4 (permalink) Old 05-03-2008, 07:51 PM
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Using a lab certified or similar known 4 dKH baking soda/distilled water solution and a few drops of Bromothymol Blue freshwater low range pH indicator inside a CO2 indicator/drop checker is a very good way to determine the good CO2 level in aquaria, IMO.

When the 4 dKH solution inside the CO2 indicator/drop checker reaches a pH of 6.6; it is a green color that means that you have approximately 30 ppm of CO2. A blue color indicates a low CO2 level and a yellow color indicates too much CO2. The solution inside the CO2 indicator/drop checker is kept separate from the aquarium water by means of an air gap between the two. This allows CO2 gas exchange between the solution and aquarium water, but not contamination. The solution inside the CO2 indicator/drop checker then reaches an equilibrium with the aquarium water.

Here's an interesting double drop checker that uses a 6.6 pH solution in one bulb and a 4 dKH solution in the other bulb.

You can use Chuck's CO2 calculator to get you in the ballpark by measuring the pH and KH of your aquarium water, but the results will be usually skewed to the high side because of phosphates in the water, plus other bases and acids in the aquarium water. Please read the whole article with the calculator. It explains things very well.

The drop checker/CO2 indicator with a lab certified or known 4 dKH solution is one of the most useful tools for a CO2 injected planted aquarium.

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post #3 of 4 (permalink) Old 05-03-2008, 07:54 PM
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My water parameters are almost identical to that and I dropped my ph to a 6.6 or 6.7 and that set my drop checker in the green. I suggest you pick up a drop checker also, that is the only sure fire way you will know if you are over or under dosing the co2. You can pick up one on ebay fairly cheap if that's available to you in Greece. Until then I would shoot a bit high for about 6.8 until you are sure. Mainly keep an eye on the fish for signs of a lack of oxygen. They will go to the top of the tank and gasp for air if you are over doing it.

EDIT: I hate when that happens, I replied at the same time someone else did.

Last edited by Vonzorfox; 05-04-2008 at 12:08 AM.
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post #4 of 4 (permalink) Old 05-04-2008, 09:57 AM Thread Starter
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Thank you both...

Your information is very useful!
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