If you're off on holiday or just short on time - an automatic fish feeder makes fish feeding that much simpler! The Eheim Auto Fish Feeder is battery operated and has easy digital LCD programming for up to a maximum of 8 feedings per day. It comes with a handy manual release ...If you're off on holiday or just short on time - an automatic fish feeder makes fish feeding that much simpler! The Eheim Auto Fish Feeder is battery operated and has easy digital LCD programming for up to a maximum of 8 feedings per day. It comes with a handy manual release button so you can top up a daily meal or snack without overriding a planned feeding program, and the adjustable slider allows you to set desired portions suitable for your tank size and stocking levels.