I've had my Kanger ProTank 2 since they came out and so far no leaks or gurgles or any trouble at all. Now I'm intrigued by the Kanger Aerotank with dual coils. Is it worth the change from PT2 to Aerotank with bottom coils or just invest a few dollars for the air flow adapter? I basically use the PT2 or my IB Tanked cartos.