I have a little battery powered gravel vac. It has various attachments including a little corner cleaner and an algae scrubber. I use it for all my tanks, and it works great, even if you don't want to vacuum gravel.
With planted nanos, how much water do you guys change each week? My smaller tanks are betta bowls. Some have a couple of plants but none are really "planted" in the best sense of the term, so this is new for me.