CO2 issues, almost killed fish - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 11-15-2011, 05:10 AM Thread Starter
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CO2 issues, almost killed fish

I set up a DIY co2 system in my fluval edge 6gal. It appeared to be working well, the hose was plugged with a piece of felt to make small bubbles, and then it was jammed into the filter intake.

After a couple of hours, my fish were all gasping at the top of the water. I did a fast 60-70% water change and uncapped the co2.

For the 2L soda bottle I just used 1 pack of yeast, about 2 cups of sugar and water. Do I have too much yeast in there?

I wanna get this co2 working, and I dont want to kill my fish.
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post #2 of 3 (permalink) Old 11-15-2011, 05:17 AM
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Originally Posted by pageerror404 View Post
I set up a DIY co2 system in my fluval edge 6gal. It appeared to be working well, the hose was plugged with a piece of felt to make small bubbles, and then it was jammed into the filter intake.

After a couple of hours, my fish were all gasping at the top of the water. I did a fast 60-70% water change and uncapped the co2.

For the 2L soda bottle I just used 1 pack of yeast, about 2 cups of sugar and water. Do I have too much yeast in there?

I wanna get this co2 working, and I dont want to kill my fish.
Way too much yeast. For 2 cups of sugar you want 1/2, or 1 teaspoon max of yeast. With a full packet you set that reaction into overdrive, lol.

Remeber, the yeast "eats" (basically) the sugar and creates Co2 in the process. The more yeast, the more intense the reaction...and the faster the sugar is eaten up. Even if it hadn't overwhelmed your fish, I'd be surprised if it would have ran for four days straight.

That's why the formula is 1/2 to 1 teaspoon...it's not too overpowering and it will last a few weeks like that.

Even then, watch those small tanks that are less than 10 gallons.
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post #3 of 3 (permalink) Old 11-15-2011, 05:17 AM
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You definitely want to read up on recipes for CO2. On a 20 gallon tank, you only use about 1/4 teaspoon of yeast. The more yeast the more bubbles you get, but the shorter the recipe lasts. Less yeast gives a less bubble rate, but for longer periods of time. Do yourself a favor and read up on recipes before jumping into things, ya know? A 2L bottle is also way too big for a 6g. I successfully use a 1 L on my 20 gallon.
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