Original Herakles can use Atlantis coils. I tried ni200 coils at first but moved on to kanthal 0.3 in Atlantis, 0.2 in Herakles, etc. They are slower to heat up than the 0.5 and 0.6 when vaping in the mid ranges 60s and 70s. I like the Atlantis and like the Herakles more, but not their ni200 coil. For TC, I hear Triton SS coil is nice. Have not tried it, but would think a good match for Atlantis V2. I prefer the simple Atlantis V2 design to the Triton tank, but thats just me and I dont have a Triton.