I've order my first mod yesterday, the Vamo v3, but I don't understand the difference between tanks. I've only used cartomizers and mini-tanks for my e-cig. My kit comes with 2 clearomizers but I'm assuming those aren't the same as tanks? Also, whats the difference between a $150 Kraken tank and a $20 protank? What tank should I purchase for my V3? I've heard the protank has an airy draw and that's something I'm trying to avoid