Agreed that fish can go without food for a week but I'd have someone come over to do a check in case there was a leak, filter problem, heater problem or a general power failure. At least you can call in help instead of coming home to dead fish.
WOW, thanks for all the great replies/ideas. There is really no one to come check on the tanks while we're gone. I'm going the extra feedings and water change route. I'm picking up timers today for my lights because I figured my plants couldn't go a week without lights and leaving them on 24/7 would have been an algae nightmare. =D I'll throw a harder type veggie bit into the pleco tank and the 2 other tanks that have snails (2 smaller apple snails in one and nerite in the other) the morning we leave.