For circulation I have a 3 ft ocillating tower fan. The plant is near the back walls, so not as much direct air blows on the, but I dont think this is it, as this problem seems to have happened within the last 3 days. Not a problem overtime. The variance in temp is about 15 degrees between night and morning. It might be because of the bud weight, but I have other plants that are heavier with strong stems