You can find tubing labeled "CO2 resistant" on ebay. It goes for ~50 cents per foot.
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75 gal: 4x55w PC, 2 inches Fluorite topped with 1 inch gravel, 20lb. pressurized CO2 with AquaMedic 1000 reactor, several plant species, cory cats, otos, SAEs, and large school of cardinal tetras
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