i would suggest not feeding for 5 days.
i feel that automatic feeders should really be called 'automatic over-feeders' because IMHO they all overfeed your fish. which can cause an ammonia spike, and while you are away cause fish loss, which will cause an ammonia spike....and so on. so i dont really like the use of the things...your fish will be fine for 5 days (unless you have fish that require daily feedings)