I bought a volcano inferno starter kit about a month ago and a week after that I got some extra tanks and a new drip tip. I am really enjoying vaping and looking to upgrade to a volcano lavatube or something similar/better. I have been using the default 1.5 ohm cartomizer that comes with the tube tank. My main question is what upgrade can I move to with the cartomizer on my current inferno that works with a tank. Also is the tubetank a good buy?