I have the Eheim feeder. It is a really a nice little feeder. Totally adjustable so you can really tune it in. It can feed 1,2,3 or 4 times a day and everyday or every other day, however you need to set it.
If its once in a while i'd skip the feed and decrease the daylight lamps if no SPS. In my many decades of aquaria I never had livestock perish with missed feed of 4 days. Yet, have seen many crashed nanos that were overfed by a family house sitter. Besides you can build up the copod population for live foods that could get eaten before wasting away.
Whenever I walk by my tank my fish act like they haven't been fed in days. In the morning, I am so surprised that they aren't floating on the surface because of starvation, they way they act. They act like they are starving right after I just fed them.