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I use Jello on my 10gal.

I only have to change it about every 3 months. The alcohol builds up so much in the water that it inhibits the the yeast. I have to change the water half way between, but the jello/sugar mixture stays good for about that length of time.

The output of CO2 is very very low, so I wouldn't recommend it but for small low light tanks. Like mine. I suppose you could use 2 bottles, but then you are no better off than regular DIY CO2.

Ben
 
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