Fish can go quite some time without food. In there environment before they were captured, food isn't all that plentiful like there is in our tanks. Main reason people have so many problems with ammonia issues, cycling failures. A hungry fish will search those lil voids in your tank for anything to eat, even if it's a top feeding fish. Auto-Feeders are not to bad, but they don't always give the amount of food you want. If you use flake food for example, you have to make sure no moisture gets inside the feeder, larger pieces, etc. If it clogs, your fish will be out of luck until you realize it didn't feed. I stopped using them mainly because of that issue. They do sell sinking food tablets that last for a few days. Not sure of your fish inparticular but I would check into it, or have a friend do the feeding for you.