First let me say I am glad I came across this site, seems like everybody is blowing smoke. Just a joke... I recently bought a 500 gal propane tank converted to a smoker. I tried to use it over the weekend and couldnt get the temp. at the middle & front over 190 although the gauge was reading 325. My fire box is in the center of the unit on the back with 2- 4inch stacks on the top of the smoker. The fire box is about 30 inch wide by 19 tall with a 22 x 9 opening inside of the box cut into the tank for the heat to go into the smoker. I am trying to see if I need to add a deflector inside the tank to guide the heat towards the front, build a bigger fire box, add more openings for the box to breath, or what. Any suggestions would be great thanks.