When I was in High School I buit a couple of terariums as a since project.
One was tthe control and the other had this type of CO2 gen in it. Hadn't
thought of doing this for an aquarium. BTW the terarium with the CO2 source
grew about twice as fast as the control, Plants were greener and healthier.

"Rich Conley" wrote in message
...
Basically I use knox jello....a cup of sugar...mix in hot water...poor
water
into coke bottle...put in fridge till it gets hard....then put an inch of
warm
water and yeast. It doesnt put out as high levels of CO2 as the "normal"
methods...but it lasts forever....takes the yeast a while to eat
through...

PH swings dont seem to be bad.....I let the new batch go for like 2 hours
before
I swith the bottles...jsut so I'm sure its actually producing CO2....I
dont
really see any swings...any Day-night swings dont seem to effect the
fish...but
I dont measure, so I cant tell you what they are...

With high light, CO2...actually keeps PH crashes from happening. In
fertilized
high-light tanks, the plants will eat all the carbonate in the water, if
you
dont have CO2...and your PH will crash...CO2 keeps the plants from eating
the
carbonate.

Harry Muscle wrote:

"Rich Conley" wrote in message
...
Exactly...lost of light, and the plants and no CO2 means the plants
become
CO2 limited from growing fast..and cant use all the nutrients in the
water...so the algae do....algae soup.....

I use the DIY jello recipe...I touch the bottle once a
month...absolutely
no
hastle whatsoever.


Never heard of the jello recipe, could you point me to a place on the
web
that would outline it a bit more? Also, what about PH swings, I've
always
been worried about greater PH swings with DIY stuff as compared to
compressed.

Thanks,
Harry

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