Can you have too much CO2

laurenrocksth

laurenrocksth

AC Members
Jun 24, 2008
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Milford, NH
I am strongly considering adding DIY CO2 to my just planted 55. I was going to use a yeast sugar mixture that was referred to me by another AC member. This is all mixed together in a 2L bottle. My question is should I have more than one CO2 bottle going in the tank at once or is the one bottle (reactor?) enough? I don't want to OD my fish on CO2 which I guess is bad.
 
There are several articles and threads throughout AC about DIY CO2. I think they usually suggest 2 bottles for a 55. Yes you can use too much CO2 and kill your fish, but not likely from yeast/sugar. Make sure you read some first before setting this up so you understand what's going on :)
 
I made DIY work with 2 bottles quite well on a 75g tank, you should use 2 bottles on the 55 and it will likely do you just fine. :)
 
I've got very minimal surface agitation (nearly none) and pretty good diffusion of the CO2 into the water on my 46g tank and I use 2x 1 Gallon DIY bottles w/o ODing.
 
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