CO2 At Night? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 09-17-2003, 04:01 PM Thread Starter
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Location: Indianapolis, IN
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I know, I know, I have posted a lot of topics about CO2 recently... my search for the perfect solution has been long and still not complete. I want to do a DIY, to save money. But I have read that the Yeast methods do not produce enough CO2, and need to be refilled very often. I have also read that if you go with pressurized system, it's a lot more expensive and you need a bunch of fancy hardware to measure PH... auto shutoff, etc.... because you should not have CO2 at night, correct? So then what happens with the yeast mixes, they do not shut off at night automatically... isn't this bad because your PH will continue to drop? I just want to get some sort of CO2 into my 29 gallon, but I can not decode what method to use. Any help would be great.
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post #2 of 3 (permalink) Old 09-17-2003, 04:37 PM
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DIY CO2 will run continuously untill the mix has been used up. So yes, at night your Ph will drop. Now DIY mixes dont usually produce as high a concentration of CO2 so your Ph drops wont be excessive. In a smaller tank like yours you could get away with 1-2 bottles of DIY CO2 pretty easily.

Compressed CO2 systems are more expensive, UP FRONT. However the ongoing costs are very low as you only need to fill the bottle every year or so. Maybe even longer on a tank of that size.

If I were you, I would start with DIY. Its cheap to start, and you can judge for yourself if you feel the investment in a better system will be worth it.
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post #3 of 3 (permalink) Old 09-17-2003, 05:24 PM
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Also this depends on the carbonate hardness (KH) of your water. Unless your water is really soft, the fluctuations will be minor, thus many ppl run even their pressurized systems 24/7.

You CAN interrupt a DIY CO2 system at night, with a little T-connection and a solenoid that opens at night, so the CO2 escapes.

Also keep in mind that if your room is colder at night, and ballasts and light heat up the solution during the day, you will have a higher output during the daytime, since the reaction speed increases with higher temps.

Yeast does not produce enough CO2? Depends on how much is not enough... I am using two 3 liter bottles on my 100 gal tank, and with 100% of it dissolving it is enough. PH drops from 7.6 to about 7, and plants grow fine.

I don't have a problem mixing some sugar and water every 10 days... doesn't seem like too much trouble for me... yet.
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