the only issues i think of kung sakaling mag-fail yung equipment ay :
1. battery life
2. obstructions near the rotating food drum
3. moisture on fish food
even my colleagues here in japan, they go on a 2 week home leave then leaves their fishes with an auto feeder. ideal design ng autofeeder ay yung frequency and amount of food to disperse. yung tetra brand (gamit ko) may manual, 12, and 24 hour settings tapos nali-limit mo yung dami ng ibinabagsak na food.