CO2 is a naturally occuring element (in our air of course) and it doesn't have any ill effects in the quantity your talking about in a rats lungs. The snakes have more CO2 in their lungs that they exhale when the hiss than a rat would have so I wouldn't be to worried about not feeding it for several hours. I feed straight from the "gas chamber" to the snake box and have for years. I believe whomever told you that may have been thinking of a more substantial quantity of CO2 (which of course would not be smart or practical - they would suffocate their snake). I wouldn't worry about it at all. Very safe and clean method of feeding for your reptiles. Not blasting by any means, just wanting to correct a misconception.
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2.1 RTB (Zander, Ridick, Liliana)
1.1 Burms (Vladamir, Natalia)
0.1 Lavender Albino Retic (Katerina)
1.1 100% Het Tigers (Nicholi & Charlamaine)
2.3 Silver fox rabbits
many, many, many, many rats
"So, just how big a boy are ya???!!"

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