So I have a twenty pound tank full of Co2 and a regulator... I don't have the money for a monitor as of yet, but I have it set on a timer to run half hour intervals during the light cycle. My room is 26x39x72 inches. What do I need to set my regulator o. In order for it to get enough ppm?? I figure there has to be some formula for this I just can't find it ... please help
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