I agree with the above posts, a week is too long. Two days maybe, but a week? What about a friend/neighbor? There are also businesses that can come into your home to feed your fish, and they are reasonably priced. If you went through one of these companies and didn't want them fed 2x a day once should be okay. I have left my fish and have had someone else feed one time a day until I was back and everything went great. However, I would do tests on the tank to make sure all levels are okay before you leave so there aren't any problems. You can correct high levels an person who is just there to feed the fish can't. Good luck!