Hi, and welcome to the forum!
Simple... yes... annoying... no! LOL
Yes, you can use the Triton Mini tank with the eLeaf 40W-TC. Yes, 50/50 juices will wick well with the Triton Mini / Nautilus coils, and many of our users prefer the 1.6 Ohm and 1.8 Ohm coils over all other offerings. Depending on your juice, you'll want to use a lower Wattage, say somewhere between 9W and 18W?
That battery will also handle Temp Control coils in Ni200 and Ti, but I'd not venture into TC until you have a better handle on coil resistances and Wattage under "normal" use
Feel free to ask anything... we're always willing to help... and help you spend money...