@Uncouth32
A Subohm tank is one that can handle coil resistance below 1 Ohms (Hence the term, Sub ohm) so you can draw more flavor and vapor from your juices by using low resistance.
Examples will be the Kanger Tech Subtank, Smok TFV4, Uwell Crown...too many others as well.
Looking at your setup, it might be the juice, though I cant be sure. If you are able to, invest in a new setup, like the Kanger Subox Mini Starter Kits or the Evic VTC Mini. They got everything you need to start off with.