OK all, I made a Homemade Co2 Bucket that I seen on YouTube. It's a 5-Gal. Home Depot Bucket that I cut a 3" hole in the lid. Ran a Fish Tank Heater through the hole & mounted a Fish Tank Pump over the hole I cut out of the lid. Then sealed a plastic bowl over the pump & hole with silicone to prevent any air leaks. The Co2 gets sucked up through the fish pump & disbursed through the hose. There was nothing about any type of air lock in the video so I'm wondering if one is needed ? Also....the video's I've watched have not given any info on how much yeast & sugar & water to use in a 5 Gallon Bucket. Anybody have that info ? My tent is still running mid 80's when sealed up tight so Co2 should help some. Plants just sprouted so I haven't turned on charcoal filter / fan to exhaust the tent as of yet so temp may drop some. Going to find out tonight. Never the less....I want to try Co2. My last grow was 1 plant just to see if I could do it. Well the temps were 86 - 91 degrees most the time & I could not get the temps down. End result was huge, fluffy, light weight buds. Looked like 5 oz. (Filled 4 qt. jars) but only weighed 2 & 3/4 oz. Still Azz Kickin' Stuff though !!! But I hear it was the high temps that caused this. I was using 400 Watt HPS at the time. Now I use 3 - 600 Watt LED's in a tent 4 times the size. (4' x 8' x 7') Temps are about 7 degrees lower with the LED's.