The short answer
Yes — a healthy, established tank is usually fine left alone for a week. Most adult community fish tolerate around seven days without food perfectly well, so a week’s holiday needs far less preparation than people expect. In fact the biggest risk isn’t hunger at all; it’s overfeeding by a well-meaning helper, or a dirty tank left unprepared before you go.
Prep the tank before you leave
A week away is really about starting from a clean, stable base:
- Do a water change a day or two before you leave and test the water so you know it’s in good shape.
- Clean or check the filter so it won’t clog while you’re gone.
- Don’t add new fish right before a trip — save that for when you’re home to watch them.
- Check the heater and timer are working reliably.
Feed normally right up to departure day — don’t dump in extra food to “stock up,” as fish can’t store it and the leftovers just pollute the water.
Feeding options for a week
For a single week, the simplest and safest choice for most tanks is often not to feed at all — see how long can aquarium fish go without food?. If you’d rather they were fed, a programmable automatic feeder dispensing small portions is far more reliable than a human, and avoids the overfeeding trap. Skip the dissolving “holiday blocks,” which can cloud water.
Longer than a week
Beyond seven to ten days, lean on an automatic feeder and, ideally, a trusted person to eyeball the tank for problems (a stuck heater, a dead fish, a leak) rather than to feed. Brief them on what a healthy tank looks like and leave your contact details.
For feeding amounts see how often should I feed my fish?, and browse the fish food hub for auto-feeder-friendly options. Keeping up your normal aquarium maintenance routine is what makes leaving worry-free.