This free aquarium breeding tank planner tells you what size breeding tank each species group needs, what spawning setup it needs, and when fry should be separated from the parents. 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 Species group, Breeding pairs. 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: one pair of cichlids needs a breeding tank of about 80 litres, a flat stone or cave for spawning, and fry separation about 14 days after hatching.
Give the pair privacy. A breeding tank in a quiet spot with dim light and few passers-by produces far more spawns than a busy display tank with constant traffic.
Feed live or frozen food before spawning. Rich food signals good conditions to the parents and improves egg quality, while dry flakes alone often give weak spawns.
Plan the fry tank before the eggs hatch. Fry grow fast and need their own space within weeks, so a tank found in a panic is usually too small or uncycled.
Common question: Why separate fry from parents? Because many parents eat their own fry, and even caring parents can stress fry by guarding them too hard. Separation raises survival a lot.
Common question: Do I need a separate breeding tank at all? For livebearers in a planted tank, sometimes not, but survival is far lower. A dedicated tank lets you control food, water, and predators.
Common question: How do I know spawning is near? Look for brighter colours, chasing, cleaning of a stone or leaf, and a swollen belly in females. When you see cleaning behaviour, spawning is usually days away.
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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