No, the Vivi Nova has it's own heating element and wick. So you don't need a cartomizer. You just fill it and go. The metal tanks are an extra accessory (about $4) that you can get to replace the clear tank. They come in colors and won't crack with some juice, like clear plastic tanks do sometimes. So, if you like to vape cinnamon or citrus juice, or some cola or other high acid juices, you can use a metal tank and save the plastic one.
The Vivi Nova comes with 3 heads. Those are little parts, like mini-atomizers, with a wick and a coil. They screw onto a post in the tank. The kit comes with 1.8ohm, 2.4ohm and 2.8ohms. You can buy extra ones in case they burn out or if you just want extras of a certain resistance. They also cost about $3 or so.
The best pictures are at Gotvapes.com. If you go there, you can see all the parts and the assembled tank and it will all make more sense. The one they sell is the Version 2.5 with longer wicks. All the other sites have the Version 2 with the shorter wicks. So, just go to Gotvapes to see the best pictures, but check the prices at the other sites.