For a week I wouldn't worry, do a water change before you leave and don't feed. Lights on a timer. Don't ask someone to do anything. Trust me easier to fast them and the plants they'll be fine
In a heavily planted tank, most fish could probably go a month or more very easily. They can survive off of eating the plants and aufwachs (biofilm) that grows on the plants.I'm VERY new to this, but I thought the concern would be for the fish. Will fish be okay for a week without food?...honest question.