I agree with everything stated. If you must have someone feed them, divide the food into pill containers ($2 Shop) and hide the rest or don't feed them at all if the tank is well established, fully planted and not overstocked.
We regualrly go away up to 10 days at a time and don't feed the fish.
Do not be tempted to feed them extra the night before either!! Make sure the filter is clean and running well. Do a water change a couple of days before then off you go.