Stocking guideline
Use adult fish size and real water volume. This is a planning aid for peaceful freshwater community tanks, not a stocking guarantee.
Always check adult size, aggression, minimum group size, temperature, water parameters, and compatibility before buying fish.
How to use a stocking guideline responsibly
Aquarium stocking is not only a volume problem. A peaceful group of small schooling fish is different from territorial cichlids, messy goldfish, or fast swimmers that need long tanks. Use this calculator to slow down the first plan, then confirm species-specific needs before buying livestock.
Aquarium stocking FAQ
Can this tell me exactly how many fish to keep?
No. It gives a cautious planning guideline. Final stocking depends on adult size, aggression, territory, group size, filtration, oxygen, aquascape, and maintenance.
Should I use adult fish size?
Yes. Juvenile fish often look safe in a small tank but can outgrow it. Plan around adult size and adult behavior.
Why are goldfish and messy fish different?
Messy fish produce more waste and often need more water, stronger filtration, and more maintenance than slim small community fish of the same length.