The 30-second verdict
Every summer, half this country flies home for weeks at a time — and every autumn the same story repeats: the tank was fine for months, someone went on holiday, and now the fish are dead.
Here is the part that changes how you plan: most holiday fish deaths are caused by the preparations, not the absence. The double-feeding "to stock them up." The dissolving feeder block. The helpful neighbour with the food tub. The fish would have been safer if their owner had simply locked the door and left.
The plan by trip length:
| Away for | Plan |
|---|---|
| Up to 7 days | Feed nothing. Nobody visits. Water change before you go. This is the safest option that exists. |
| 1–2 weeks | Automatic feeder (tested for two weeks first), or a helper with pre-portioned food. Battery air pump on standby. |
| 2 weeks + | A briefed helper visiting every 2–3 days, pre-portioned food, written instructions, and your phone number. |
And in a UAE summer, one more thing outranks food entirely: what happens to the room temperature while you are gone. That is the part specific to here, and it is further down.
Why "feed nothing" is the safe answer
A healthy adult fish is built for scarcity. In the wild, food comes irregularly; a week without eating is not an emergency, it is Tuesday. Fish routinely handle 7–10 days of fasting with no harm at all.
What they are not built for is what happens when you try to compensate:
- "Stocking them up" before you leave — a double portion the night before produces uneaten food and a wave of waste, so you leave town at exactly the moment the ammonia starts climbing, with nobody there to see it.
- Holiday feeder blocks — they dissolve on their own schedule regardless of whether anyone eats, fouling the water for days. They solve a problem you did not have and create one you cannot fix from abroad.
- The unbriefed helper — the single most common cause. A kind person sees fish begging (fish always beg — begging is not hunger), and feeds them. Generously. Daily. You come home to a crashed tank and a neighbour who was only being nice.
So for a week or less: water change a day or two before you fly, normal feed on the last day, lights on a timer, and leave. Nothing else. The tank is safer without intervention.
The week before you fly
Whatever the trip length, the same five preparations:
- Water change 2–3 days before departure — not the morning you leave. If anything goes wrong (a temperature mismatch, a stirred-up mess), you are still there to see it.
- Do not add anything new. No new fish, no new plants, no new equipment in the final two weeks. Every change is a risk, and you want zero open risks when you close the door. (Stocking discipline: how many fish.)
- Clean the filter intake and check the flow — a filter that is already half-clogged is the one that fails in week two. Rinse media gently in tank water only: filtration basics.
- Lights on a timer, 6 hours a day. Less light also means less algae while nobody is there to intervene: the algae guide.
- Top up the water level — evaporation continues while you are away, and in this climate it is fast. Which brings us to the local problem.
The UAE-specific part: the AC decision
Everywhere else, holiday tank advice is about food. Here, it is about heat.
If you switch the AC off to save electricity for a month, the flat will sit at 38–45 °C by August. The tank follows the room. Warm water holds less oxygen, evaporation accelerates enormously, and the fish cook slowly in water that looks perfectly clear. No feeding plan survives a 40 °C room.
The choices, honestly ranked:
- Leave the AC on, set to 26–28 °C. The right answer for any tank you care about. The cost of a month of moderate AC is a fraction of restocking a dead tank — and a timer or smart thermostat cycling it keeps the cost sane. It does not need to be cold; it needs to be capped.
- AC on a schedule (a few hours in the afternoon peak) — acceptable for hardy fish, keeps the worst of the spike off. The tank will run warm; make sure surface agitation is strong before you leave: the summer oxygen problem.
- AC off entirely — with livestock in the tank, this is not a plan. If the flat will genuinely be unconditioned for weeks, the honest options are rehoming the fish for the summer or not keeping fish over the summer. That sounds severe; it is what the temperatures here actually mean.
Also: close the curtains. A tank that catches sun through a window in an empty, warming flat is the worst-case scenario, and it costs nothing to prevent.
If someone is coming in
For trips over two weeks, a helper is worth having — but a helper's kindness is the risk to manage. Three rules:
- Pre-portion every feed. Small containers or a pill organiser, one compartment per visit, labelled by date. Do not leave the tub anywhere visible. Take it with you if you have to. This single step prevents the most common holiday disaster.
- Write the instructions down, short enough to be followed: feed one compartment per visit · top up the tank from the marked container (RO/distilled water, not tap — why) · check the temperature and the filter outflow · message me a photo. That is the whole job.
- Brief them on the two emergencies: if the power has been off for hours, switch on the battery air pump and do not restart the filter without messaging you first (the power-cut plan — send them this link). If fish are gasping at the surface, more surface agitation, not more food.
Automatic feeders
Genuinely useful for 1–3 week trips — with one rule: run it for two full weeks while you are still home. Feeders jam, double-dose, and clump in humidity (and humidity is not in short supply here). The time to discover your feeder's personality is not from another country.
Set it to feed less than your normal amount — remember the filter is unattended too. And put a desiccant capsule in the hopper; clumped flakes are the classic humid-climate feeder failure.
While you are away
A camera pointed at the tank is a surprisingly good investment for peace of mind — you can check the water level, see the filter ripple, and confirm the lights are cycling, all from your phone. A smart plug with energy monitoring on the filter tells you it is actually running.
And a smart thermometer with an app alert is the single most useful gadget for this country: it tells you the AC failed while there is still time to send someone.
When you come back
- Look before you touch. Everyone alive? Water clear? Filter flowing?
- Test ammonia and nitrite before feeding anything.
- Do a normal water change — not a huge one. The tank has drifted while you were away; move it back gently. Shrimp especially hate a big sudden correction: the shrimp rules.
- Feed lightly the first day — they will act starving; they are not.
- Top up from the right container — the level will be low, and the temptation is a fast tap-water fill. Temperature-match it.
Common questions
Will my fish really be fine for a week with no food? A healthy adult fish, yes, completely. Fry and very small fish are different — they need the automatic feeder or the helper. If your tank is mostly juveniles, plan as if the trip is longer.
Can I just reduce the AC instead of leaving it on? Yes — capping the room at 30 °C is a perfectly good outcome. What you cannot do is let the room free-run in August.
What about my shrimp tank? Shrimp graze biofilm continuously and handle a fasting fortnight better than fish do. Their risk is heat — they stress above 28–29 °C — so for a shrimp tank the AC decision is the whole plan.
My helper can only come once a week. Is that enough? For feeding, honestly, yes — fish fed once a week for a month are fine. The real value of the visit is the check: temperature, filter running, nothing dead. Once a week covers that too.
What is the single most important thing on this page? Pre-portion the food and hide the tub. Second: do not let the flat free-run above 30 °C. Everything else is refinement.