I've got an atimisque tank that is super loose on this Sophia v2. The other tank I have is a smok chrome plated aluminum 17mm tank that the chrome has come off and the aluminum is really pitted.
The IBTs, Big Daddy, and little honeycombs are all 19mm for sure. Can't recall if the elephant is Unique or Bella, but I think that one may be too, along with the Splash (red & black).