Same here David_M - I feed them on dried food and it doesn't come to any harm sitting in the bowls. In fact the three of them 'graze' all day!! Whenever their peckish the food is ready for them. A couple of mouthfuls and their off - games to play, people to annoy(!) and sleep to sleep!!
Try yours on dried food and see if Midnight wants to be a grazer instead of a two meal a day pus!!

Lynne