Whats the best yeast/sugar mixture for DIY CO2 on 10 gallon? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 06-20-2011, 06:30 PM Thread Starter
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Whats the best yeast/sugar mixture for DIY CO2 on 10 gallon?

I have a 1.24L bottle and I want to make a DIY CO2 system for a 10 gallon, what would be the best sugar/yeast mixture for the tank? I don't have any water parameter readings, so I won't be able to measure the Ph the CO2 gives out, the only inhabitants are nerites, mystery snails, and a betta.
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post #2 of 8 (permalink) Old 06-22-2011, 03:26 AM
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Standard setup

1/4 teaspoon (5ml) Active dry yeast - use your cap from conditioner/bacteria as a measuring tool.

1/2 teaspoon baking soda

2 cups of sugar (cup-std yogurt serving size)

Fill 3/4 of container with warm water, add ingredients, shake and wait 12-24hrs for gases to develop before attaching to diffuser, preferably a Elite mini pump's intake. Also add a check valve before adding line into aquarium. Another mod before the aquarium line might be a gas filter column with dessicant(Epson salt aka magnesium sulfate), carbon and/or zeolite.

Remember: You only want to add the generated gases NOT the solution INTO the tank.

Regarding Dosers: There are various DIY for CO2 dosers (search is your friend) i'm working on modding a plastic vial with plastic pipet, with a homemade 4dKH baking soda solution
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post #3 of 8 (permalink) Old 06-22-2011, 03:45 AM Thread Starter
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Thanks! I'll probably diffuse it by placing the tube in the intake area of my filter.

Do I need to have baking soda, or will yeast and sugar be sufficient?
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post #4 of 8 (permalink) Old 06-22-2011, 11:30 PM
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Baking soda

My understanding is that it will react as a solution buffer from getting too acidic. Might help the yeast live longer but the alcohol/acetic acid formed will eventually kill it. I've read online of people (from brewing business) using castor oil to separate alcohol, but this is going far for a cheap DIY CO2 setup.
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post #5 of 8 (permalink) Old 06-23-2011, 12:07 AM Thread Starter
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I see, I don't mind changing out the yeast often, so I'll skip it. Thanks!
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post #6 of 8 (permalink) Old 06-23-2011, 12:29 AM
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Originally Posted by limeslide View Post
I see, I don't mind changing out the yeast often, so I'll skip it. Thanks!
I've used baking soda and not used backing soda in my DIY CO2 system and if there's a difference, it must be minimal.
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post #7 of 8 (permalink) Old 06-23-2011, 01:11 AM Thread Starter
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Yeah, I won't add it because I don't have any though.

i love corydoras
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post #8 of 8 (permalink) Old 06-24-2011, 03:45 AM
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Wikipedia Entry

I just noticed wikipedia entry for Yeast aquarium hobby has several drops of vegetable oil to reduce surface tension for bubble release to get things started quicker.
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