If you go on vacation, use an automatic feeder like the Penn-Plax Daily Double II Battery-Operated Automatic Fish Feeder. Retails around $20. Set up a few days before you leave to test. Could use two separate feeders for different types of food. Feeders allow for varying amounts and feed twice per day. Very easy, reliable and inexpensive. This way you don’t have someone coming into your house when you are not home. Peace of mind on vacation.