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post #6 of (permalink) Old 03-23-2013, 05:55 PM
Planted Tank Guru
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Join Date: Feb 2010
Location: Newbury Park, CA
Posts: 3,953
CO2 isn't poisonous, it is inert. It is only if the room is closed and all the gas escapes that it is dangerous at all. One danger is if the needle valve is bumped too much gas could kill your livestock and that can happen with curious kids around. My needle valve locks down so that cannot happen.

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