I leave food in overnight for our blacknecks and checkereds overnight. One of the blacknecks will only eat when I'm not looking, so she doesn't get supervised, the checkereds will all eat while I watch (if they're hungry) and will generally tong feed. The blacknecks I just have to guess whether they've fed, although the female is getting better and I can watch her from a distance. It's the male blackneck that will only eat when we're not in the room, hence food gets left in overnight. It's not what I want to do, but a risk I accept to give him a chance to eat...