Is the subtank mini hard to maintain? Like does it require daily cleaning everytime you use it?
No it does not need cleaning every day. An initial cleaning to remove any manufacturing residue, dry, add 4 drops to inside of coil and a drop on each juice hole, screw to base, fill tank, put back together, let sit about 10 minutes. Close the airflow completely and take a couple of deep draws without firing. Open the airflow to the smallest hole. Now set your mod to 12 watts and try a few vapes, then gradually increase the wattage and open the airflow until you find your sweet spot. For me on the .5 ohm stock coil, that is around 25 watts airflow wide open. The 1.2 I believe are best around 12 -15 watts. Set the airflow as desired
After this, I just clean when I change the coil.