You should pop a CO2 generator in there, they're not too pricey for a room that size and a tank of propane will last a whole roundIt's a 16x11 room and I'm squeezing 70 plants in there. I get the plants either as babies and teens and they get to veg for around 3 weeks. I got 10 pounds the first two times but it's gone down to 7-8 and sometimes 6 when things go wrong like mold. I'm using 6 Gavita 1000 lights and putting them in 5-gallon pots. I feed them 1.5L of water every 2 days usually. How can I increase my yield to a constant 10 pounds a harvest? any tips would be appreciated.