I wouldn't add potato water, and I wouldn't be concerned about light hitting the tank, Near a window that's not in full sun most of the day would probably be okay. They don't seem to require much care. I've bailed a gal or two of water out of the 10 gal tank a couple times. It's easy to scoop up a scud or two when you do that. I have a small water celery plant in the 3 gal talk, and they like that. I would like to have several plants in the 10 gal tank too.
