I got ya covered, sorry late for me. Had a run, then had to make dinner, well, you get the picture. =)
Nano in my terms is anything under 30g.
Easy to care for, yes. If water parameters are watched closely. If they start to go south, they go way south in a hurry because there is no volume to keep them stable. So when you get evaporation, you need to keep up with the tops offs, salt does not evaporate with the water, and therefore can get high really fast with water going out and not being replaced. It certainly costs a bunch less to run and operate than the bigger tanks though.