Corleone
Fish Herder
With a cycled tank, going on holiday is usually no problem. Healthy, well fed fish can go a long time without food - a week is no problem, many people have pushed it 2-3 weeks. If you have a neighbor feed them, have them feed once or twice a week, rather than daily, and measure amounts ahead of time and hide the cans. Many new owners overfeed, and many people who don't keep fish will take their eager jumping at food to mean they're still hungry and may overfeed. Do a big water change beforehand to get nitrates down, and feed lightly when you first return.