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[APD] DIY CO2 recipe for 20 gal tank?

Hey, I almost fell for that last joke about the fish tank on the radiator too! But the following question is quite real, so please help if you can.

Anybody have a good recipe for diy CO2 for a 20 gallon tank? 

I currently have a 50 gallon and I use 1.5 cups white sugar, 1/2 tsp yeast, and 1/2 tsp baking soda. It has worked great, so I gave this recipe to my friend who has a 20 gallon. I warned him that it would be way too much CO2 for his tank and that he
would need to cut it back, but we didn't know by how much to alter the ingredients. He got his lights ready, up to about 3wpg, so CO2 was the next step. 

Anyway, he guessed at a smaller recipe and it apparently wasn't small enough, because a couple of his fish died so he discontinued the CO2. He said the fish got white lips. Are white lips then the first sign you are overdosing (other than of course
the pH and dkH using the CO2 chart, which I'm not sure I completely trust)? Is there some formula so that one could approximate the correct recipe for any size tank, without just chancing it?

Thanks for any advice,
Kelleen Harris
kelleen_harris at csumb_edu

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