I am a all day tank user. By the looks of it, that's a Smoktech tank and carto. May be re-branded. I agree that you need to fill the carto completely. It will hold about 1ml (1cc). But it takes awhile to get it in there. Add some wait, rinse and repeat. Then fill the tank with the caps on. Do this by sliding the carto down slightly and tilting the carto to one side. Either carefully drip in, or use syringe or needle bottle. When you push the carto backup you will not displace any juice. If you are flooded on top of the carto even after waiting for it to settle, use a paper towel to soak it up. after getting juice mouth (we have all done it), rinse and dry your drip tip.
In case you are not getting good air flow, you can use a small size paper clip straitened out. You insert from the batter 510 side. Do not force it! If you encounter resistance pull back try again slight new angle. Once you see the wire through the top, you can move up and down 5 to 8 mm to clear the air flow.
Lets keep trying, we will coach you through it. You will love the tank once you figure it out.
Sev
In case you are not getting good air flow, you can use a small size paper clip straitened out. You insert from the batter 510 side. Do not force it! If you encounter resistance pull back try again slight new angle. Once you see the wire through the top, you can move up and down 5 to 8 mm to clear the air flow.
Lets keep trying, we will coach you through it. You will love the tank once you figure it out.
Sev