DIY CO2 over done???
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Old Today, 03:39 AM   #1
Maryland Guppy
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DIY CO2 over done???


Mixed a 3 liter bottle of DIY.
2 cups sugar, 1tsp baking soda, 1.25tsp dry yeast.
Activated yeast with 78 degree tank water.
Mixed all together and instant CO2?
This occurred 5 days ago mind you.

Using a needle valve fed to a DIY CO2 reactor.
CO2 has constantly been climbing and guppies are gasping for air.
Almost @ 60ppm of CO2 in a 40 gallon long.
Using the charts or the math they show the same.
3 liter bottle seems ready to bust using needle valve as restriction.
I have to gas the bottle off by opening to atmosphere occasionally.

Is this really possible with DIY CO2???
I have acquired a CO2 tank with regulators and ready to swap out.
I acquired materials thinking DIY would be minimal production.
KH of 8 and pH of 6.6 ppm of CO2 59.something.

Does this sound right???
New to CO2 in a planted tank.
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Old Today, 05:55 AM   #2
Darkblade48
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I suppose it is possible to cause stress to your fish with DIY CO2, particularly if you are injecting a lot of CO2.

Most people do not use more than a 1/3 of a teaspoon of yeast. You have essentially used 3-4x the normal amount, causing a large amount of CO2 to be produced very quickly.
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Old Today, 06:11 AM   #3
burr740
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Wow that's a lot of yeast! What you're most likely going to have is a very high production rate that only last for a few days before drastically reducing.

When I was doing 3 liter bottles, I'd use 2.5 cups sugar, 1/2 tsp of yeast (very slightly heaped), and 1 tsb baking soda. The mixture would run steady for two weeks before starting a slow decline. I played around with different amounts of yeast/sugar. The most yeast I ever used was 3/4 tsp. That produced almost double the output but fell off greatly after 4-5 days.

Holy crap 1.25 tsp
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Old Today, 02:04 PM   #4
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Question burr240 what ratio would be best if I were to use 1.36 liter bottle, it's a V8 juice bottle?
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Old Today, 02:06 PM   #5
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What burr said is spot on. The high output is brief while the alcohol content will also rise just as fast and bring the yeast production to a halt.
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Old Today, 02:11 PM   #6
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It'll stink bad if that sucker pops lol.
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Old Today, 02:36 PM   #7
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Quote:
Originally Posted by quiquik View Post
Question burr240 what ratio would be best if I were to use 1.36 liter bottle, it's a V8 juice bottle?
Not sure, the smallest thing I've ever used is 1.89 liter Juicy juice bottles. Have two going now on a 20 gal, as a matter of fact. I do 2 cups sugar, barely 1/2 tsp yeast, and 1 tsp baking soda.

For that size I'd probably start with something like 1.5 cups sugar and 1/3 tsp yeast, or maybe 1/4. But that's just a guess. You'll probably have to play around with it and see what works best. The idea is to get a steady rate for as long as possible. One bubble per second for a couple of weeks straight is better than three for a few days, then two, then one. It's good to have a gas separator/bubble counter bottle so you can keep an eye on the bubble rate. As soon as production slows down it's time to make a new batch.
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