Get a PPM controller it will make things much easier. And as far as your space goes the 3x3x9 you could have just got a tank and a regulator and saved some money are you growing in a closet. Generators are for somewhat bigger spaces like say a 10x10x10 room. Is your's natural gas or propane. Most people hang them from the studs in the ceiling to get them above the plants then put a circulating fan under them on like a medium setting to help spread the Co2 good luck and don't burn your house down these things are dangerous if not used correctly..........:thumbsup: