He gets fed twice per day, and a bloodworm for a treat every second day. We don't let it sit around, whatever doesn't get eaten gets sucked up with a turkey baster. The light stays on during the day, but we turn it off at night. We tried leaving the light off for a couple of days, but Finnigan was miserable. There isn't any natural light. I've heard that completely blacking the tank out for a few days with garbage bags might kill it, but i don't really want to move him into his little bowl for that long. It's really gross. I can handle scraping it off the glass. I bought one if those magnet things, it works really well, but it has started growing in the gravel and the filter as well. I will keep an eye out for a nerite, I think my local shop only has apple/mystery snails though.