Me again with more questions! I bought a Russian the other day and they built it for me at the store. It worked great for a while, but then after a day, the vapor production dropped off. I just put a fresh coil (2.5 ohms) in my Protank 2 and it is producing more vapor than the Russian. Does anyone have any ideas as to what the problem might be? Also, the clear tank cracked and I was wondering if it was because of the juice I am using? I am using 70% VG and was told that sometimes fruit type juices could crack a tank, although it does not happen with my Protanks. Thanks. Mark