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Re: DIY CO2 problem


A few things can help you, Tom had posted a nice method using Jello to slow
down the production of CO2 and keep it more even over the lifespan of the
bottle. I prepare a bottle and let it sit for the first 24-48 hours before
replacing the old one, this allows that initial burst of CO2 to end. You
might also want to check your PH in the mornings before the lights come on.

Hope that helps
Giancarlo Podio

----- Original Message -----

  a.. To: aquatic-plants at actwin_com
  b.. Subject: DIY CO2 problem
  c.. From: Cheryl Trine <ctrine at andrews_edu>
  d.. Date: Tue, 18 Mar 2003 12:24:26 -0500


I recently (about 2 mo. ago) set up a DIY soda bottle-yeast reactor for
a 10 gal.  tank. But I sometimes have problems with wild pH swings when
I start a new bottle.  I started one yesterday and the ph went from 7.8
to 6.8 in less than 5 hours. My  fish definitely did not like it! I was
afraid I was going to lose a couple of them. After a 50 percent water
change, which raised the pH to 7.4 they perked up a bit, and didn't just
sit at the surface. So my question is, how do you control the rate of
CO2 addition to  the tank.

My tap water parameters:
pH 8.2-8.4
<1 dGH (it us run through a whole house watersoftener, other it is 16
17 dKH

My mix was 2 cups sugar, 1/2 t. yeast, 3/4 bottle of water, which I
swirl altogether. I use warm water to get the yeast started.

My previous 2 bottles have  maintained it at about 7.8. My initial
bottle, I had problems with the wild pH swing  as well, but I didn't
have fish in it then, so it was not really a problem.

Thanks for the help.