Before a holiday, perform a normal partial water change and any genuinely due filter cleaning several days before leaving so you have time to observe the aquarium afterwards. Check heater and filter operation, put lights on a timer, test any automatic feeder, prepare pre-portioned food for a sitter, leave treated top-up water if needed and write emergency instructions. Avoid adding new fish or performing a major deep clean at the last minute.
A rushed maintenance session on the morning of departure creates exactly the sort of hidden problem you will not be around to notice. Finish the work early enough to watch the tank run normally afterwards.
Two to seven days before leaving
- Perform the normal partial water change.
- Vacuum visible debris.
- Clean the filter only if it is genuinely due.
- Test the water.
- Trim dead plant material.
- Confirm the heater and filter restart correctly.
Set up lighting and feeding
Use a timer for the normal light cycle. If you need an automatic feeder, test it for several days so you can adjust portion size before departure.
Do not add new livestock at the last minute
New fish can introduce disease, aggression or an unexpected bioload increase. Aqueon recommends avoiding major changes ahead of an extended absence.
Prepare the sitter
Leave simple written instructions and pre-measured food. Mark the normal water level and leave suitable top-up water if evaporation may be significant.
Include your contact details and an experienced backup contact.
Final check on departure day
- Filter flowing normally.
- Heater holding temperature.
- No leaks.
- Lights and feeder timers operating.
- Fish behaving normally.
- Lids secure and cables safely arranged.
Frequently asked questions
Should I deep-clean the tank before a holiday?
No. Normal maintenance is safer than a major disturbance immediately before leaving.
When should I do the pre-holiday water change?
A day or two to several days before leaving gives you time to catch equipment or water-quality problems afterwards.
Should I add new fish before a trip?
Avoid it if possible. New livestock can create unexpected health or compatibility problems while you are away.
Sources and further reading
This guide separates general aquarium arithmetic from fish-welfare decisions. For species-specific limits, always check the needs of the fish you intend to keep.