I have an eLeaf iStick 30 watt and i use a aspire nautilus on it. I just bought an eLeaf iStick power nano 40 watt and it came with a MELO 3 tank, but i really hate it, it gets really hot and i have to draw on it too long before i get anything and also the mouth peice is too short. I tried my nautilus on it and it works really good, are those meant to be interchangeable ? are the aspire/melo both compatible for all of them on the isticks >?? (I know the coils will not interchange with the two tops they are really different, but the tops will both screw on to each battery.) also any others i can put on the iStick power nano ? thanks!!!! the photo is of the nano i just got and the melo on it.