Just got an arctic tank. I'm able to run my .5 0hm coil but not my .2 0hm. My friend as the same problem with his arctic with his smy. No its not a pen issue or anything like thathat. I know that. I've seen many people have this issue. But Noone seems to know why. Does anyone here know why the .5 coil works perfect. But the .2 coil doesn't work.