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Re: DIY CO2 question
> I'm planning on trying out a DIY CO2 setup soon. In the net instructions
> I've found, the recipes call for 1- to 2-liter bottles. Is the size of the
> bottle particularly important? Could I use the same recipe that is intended
> for a 2-liter bottle with a one-gallon bottle? If so, should I double the
> amounts of the ingredients?
There is nothing carved in stone by a fiery finger regarding the size of
yeast/sugar reactor bottles. I've used them ranging anywhere from 1 quart to
1 gallon, with every size in between. The 2 liter bottles work out to be
about right for a 10-29g tank, which is a very common size for an aquarium.
Hence, you see that recommended most often. Of course you can use a 1/2
gallon bottle in place of the 2 liter bottle, if that's what you have on
hand. However, a 1g bottle may be required for a 29g or larger tank that you
can't maintain therapeutic levels of CO2. The sugar should be maintained
approximately in the same ratio. I.e., if you were planning to run 2 cups
sugar, 1/4 tsp yeast in 1.5 liters of water, then double that formula for a 1
gallon bottle, or halve it for a 1 quart bottle. You have to experiment with
these things a bit, until you find your CO2 levels running somewhere between
10-40 ppm. I find a 1 gallon yeast/sugar reactor gives my 29g tank about
16-18 ppm of CO2, so that's what I run.