I'm going to be out of town for a week, and during the time I will be gone, the power will be out for a few hours one day. My concern is that my filter doesn't always restart by itself after it has been off, it usually needs to be primed with water first. What I am worried about is my fish being in an unfiltered aquarium for four days, and also that my filter could be on but not working properly and thus might break or be a fire hazard. Any thoughts about this?