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C_perugiae said:
After helping a guy whose CO2 bottle was knocked over by his cat under the stand... yes, I'd be adding a check valve; the yeast backed up into his tank and the water was opaque by the time he got home from work.
You really want the check valve going the other way. So the water can't come back into the co2 bottle. If you are paranoid about yeast spill-over into the tank the best thing you could do would be to put a gas seperator on the setup. With a gas seperator (usually a 20 oz soda bottle) if you do get an overrun of yeast it would use that as a spill-over instead of your aquarium. This also lets you use the check valve the other way to prevent water from siphoning back.

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