Would DIY CO2 be overkill for a 7 gallon tank? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 04-13-2004, 11:30 AM Thread Starter
Algae Grower
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Would the typical DIY CO2 2 liter bottle and yeast recipe produce too much CO2 for a 7 gallon tank? If so, can I just scale it down? For example, use less yeast or less sugar?
My water has a PH of 7.6 and KH 6.
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post #2 of 7 (permalink) Old 04-13-2004, 12:29 PM
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Yes, it would be too much. If you have a HOB filter you can increase the offgasing by lowering the water level a bit, increasing surface agitation and lowering the CO2 of the water. If you include a bubble counter, you could then increase the water level as the bubble production slowed. You would want to keep good records of pH all through this until you got a feel for it. You could also just use a smaller container, or less sugar and yeast.

In any case, be sure to monitor CO2 in the tank and know what you target pH is and what the pH limit is so you can take action before fish are damaged.
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post #3 of 7 (permalink) Old 04-13-2004, 12:39 PM
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Fishy, you can use a small coke bottle with 3/4 cup of sugar and 1/4 tsp of yeast. It will produce 1 bubble every 5 to 6 seconds. This may suit your 7gl. I use this for my 5 gl and the solution last close to 2 weeks.
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post #4 of 7 (permalink) Old 04-13-2004, 03:17 PM
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For a tank that size just use Flourish Excel. Much easier than constantly hassling with mixes and PH tests etc.
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post #5 of 7 (permalink) Old 04-13-2004, 07:15 PM Thread Starter
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thanks for the responses. I like the idea of producing the DIY CO2 as opposed to using the Excel. I will try decreasing the amounts of yeast and sugar as suggested and see how it work.
thanks again
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post #6 of 7 (permalink) Old 04-13-2004, 07:31 PM
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I was running 2x2l DIY yeast on my 10 gallon tanks before I switched to pressurized CO2. In my experience, 1x2l of DIY will be just fine for a 7 gallon.

"Save me Jebus! And I don't even believe in Jebus!!!" Homer Simpson
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post #7 of 7 (permalink) Old 04-13-2004, 08:25 PM
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Buy a Hagen natural co2 plant gro system. the size would be perfect for a 7 gallon.
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