Neil: You should be fine with the big guys; the tetras and glo-fish would be the concern. If they look OK now, probably don't need to worry about it.
IF you decide to auto-feed: I'm a single guy who won't bug his friends about feeding, and when I do travel it's for 7 days or so... so, I have two auto-feeders. They're only geared for flake or disc type food, and the one thing I've found is that they will overfeed compared to my sparing habit of 'just enough'. So if you get a feeder, test it first, and start small! Set one up, and let it dump dry food on a piece of paper or something; then you'll know what it is doing. Lost a fish by testing in-tank; ammonia rose too much after a test.
MarkhanDave: the auto-feeders could apply to your reef fish if you have dry food that they'd eat, but like mgamer says, check with the saltwater people.