The Planted Tank Forum - View Single Post - CO2 or not with Low Tech
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Old 10-31-2012, 04:37 AM   #13
urbguy
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Jim, I'm in the same boat as you. It's a big change but I came across this and thought it'd be pretty interesting. So, have you heard of the Low-Tech Excel method? Here's a link to a site explaining the low-tech with a substitute for CO2 approach.

http://www.sudeepmandal.com/hobbies/...-planted-tank/
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