This free aquarium holiday feeding planner tells you how to feed fish while you are away, comparing feeder blocks, automatic feeders, and fasting, with a pre-holiday water-change plan. It runs fully in your browser, so nothing you type is sent to a server, and you need no account and no sign-up to use it.
Aquarium problems usually build slowly. A tank that looks fine today can drift over weeks when feeding, stocking, or water changes stay unmeasured. Small numbers, checked early, stop most trouble before fish show stress. This tool turns a guess into a number you can act on, and that number is easier to trust than a rough rule of thumb from a shop assistant.
To use the tool, type in Days away, Number of fish. Press the calculate button and the tool shows the result at once. If you change any number, press calculate again to see the new result right away. Try a few values to see how sensitive the result is to each input.
Example: 10 days away needs about 4 feeder blocks, or one automatic feeder filled for 10 portions. Fasting is not safe for 10 days, so a feeder is the right choice here.
Test any feeder a week before you leave. A feeder that dumps too much or jams on day one ruins a holiday, while a tested feeder gives you a calm departure.
Do a large water change two days before leaving, not on departure day. A change two days early leaves time to fix any problem, while a last-minute change can hide a mistake until you return.
Feed less than normal while away. Hungry fish survive, but overfed fish foul the water fast, and foul water kills far quicker than a short fast.
Common question: Can healthy adult fish fast for a week? Yes, most healthy adult fish handle 5 to 7 days without food. Fry, sick fish, and very small species cannot, so they need a feeder even for short trips.
Common question: Are feeder blocks or automatic feeders better? Automatic feeders give steadier portions and less waste, while blocks are cheap and simple. For trips over a week, an automatic feeder usually wins.
Common question: Should a neighbour feed the fish? Only with pre-measured portions, one per day, in labelled bags. A kind neighbour with an open food tub almost always overfeeds, and overfeeding is the top holiday killer.
Keep a short notebook by the tank. Write the date, the numbers you entered, the result, and anything you changed afterwards. That short record turns a vague feeling that something changed into clear evidence. After a month you can look back and see which choices helped and which ones did not, and that makes the next decision much easier.
The most common mistake is changing too much at once. When several things change in the same week, you cannot tell which change caused the result you see. Change one thing, wait, watch the fish and the water, and only then change the next thing. Slow, single changes keep a tank stable, and stable tanks keep fish healthy.
Recheck the numbers whenever anything changes in the tank. New fish, a new filter, a different food, or a change in room temperature can all shift the right answer. A quick recheck takes less than a minute and stops an old number from quietly becoming wrong. Bookmark this page so the recheck is easy.
This tool is free to use as often as you like. Bookmark it, recheck the numbers when your tank changes, and keep the daily routine steady. Small, steady habits matter far more for an aquarium than any single perfect number, and a calm routine is what fish respond to best. If a number surprises you, run the tool twice with different inputs before you act on it, and trust the steadier result.
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