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I'm pretty sure you dont want it below the tank as it will siphon and make a mess. If you dont have room at tank level I know someone found something simple to hang it from the back of the tank but I cant remember where i saw it
 

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You can also put a check valve on the tubing between the bottle and the output end. That way, if a siphon were created by a drop in pressure in your CO2 bottle, the check valve would prevent tank water from flowing into your CO2 bottle. (I keep mine below tank level and rely on a check valve.)
 

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I have mine below the tank with no check valve and have not had a problem. I experimented with it some first to see if a siphon would be created. I'm not really sure why i never had a problem but I will say i usually use warm/hot water and i get bubbles in maybe 10mins.
 

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Check valve is strongly recommended. All it takes is one time that a siphon is created for whatever reason to make it worth having one. Of course, ymmv. :)
 

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Re: DIY yeast CO2, do I set the bottle level with the tank? can i leave under the tan

I have my 24 oz separator bottle and my 3 liter yeast/sugar/water mix below my aquarium. I use check valves like a few folks have mentioned.

I keep both of my bottles in a Rubbermaid rectangular plastic mop bucket. I have a small submersible heater in the bucket to keep the water temperature around 78° F year round.
 

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I bought several check valves from LFS's. None stop backflow.

Does anyone know where to find a good one?

thanks
Charles
 

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Re: DIY yeast CO2, do I set the bottle level with the tank? can i leave under the tan

I have my 24 oz separator bottle and my 3 liter yeast/sugar/water mix below my aquarium.
Same. I do not use check valves, though, for the simple reason that my separator and 2L bottle both have lids on them.... If a siphon is created, how much water is realistically going to leave the tank? 2/5ths of not much, by my calculations... Probably just enough to fill one or both of the bottles, then the siphon will cease.
 
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