I have been using the Dual Coil tank 3.5ml by Smoktech. I started out with the Dual Coil and it worked fine with my 50/50 juice but I have since switched to the pre-punched Boge XL two hole and so far so good. No flooding yet. The only thing I do not like is that the tank comes apart to easily. I have been very careful when using it to not pull on the tank to hard.