Hi!
I currently use this for this tank:
Wotofo Dual Core Fused Clapton 0.62Ohm
LINK
The mentioned Fumytech Alien is also available in a 3mm version, but with this, the cooling was already very strong compared to others.
If you’d rather build your own coils and can’t find wire elsewhere, then check out Ali (AliExpress) here for example: LINK