I'm so happy to hear that you can take it all the way to the top of the air tube - I was wondering about that... you solved the curiosity, so I'm going to do that today. I've now had my Cero Mega for nearing 24 hours and still enjoying it SO much. It's such a relief not having to pamper a tank, go through rituals or other BS to vape (like with my Cubis & iSub tanks - both are going in the scrap pile). I also have two Anyvape Davide tanks that I like very well, too. So thank you for this tip. Yes... on to the next new toy!
I have a Phiniac etched CoolFire IV on the way - it is going to look amazing with my Cero Mega sitting on top! When I can justify more $$out I will get a pretty etched glass for it, as well.
I'm a huge Phan of Phini! And I had an etched CF4 with a few of their custom tanks for my Ceros. LOVE 'em!
thing apart if it kills me (or the glass in the tank). 




Love reading these comparisons. I will have to bite the bullet too....so sign me up.
a little later today. Just checked and my Cero Mega is "out for delivery"! I use the GS Air M and it has a long slot with the ring over it that you adjust. I'm used to that. My V2 has little holes under the ring to adjust. Either is fine with me.