If it were me, I'd feed them well before I left, and have a friend come by once or twice to feed them while I was gone. Then give them a good meal and a water change when you get back.
I think the auto feeders are too finicky and risky. If it malfunctioned and dumped all that food in at once, you'll have a tank of probably dead fish when you get back
Fish can go a fairly long time without eating (with exceptions)
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Brad
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