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The classic rule of thumb allows about 1 inch (2.5 cm) of adult fish per US gallon of water. Use this tool to get a rough capacity for your tank and compare it against the fish you plan to keep.
Enter your tank volume and stocking rule, then press Calculate.
The inches-per-gallon rule ignores swimming space, surface area, bioload and filtration. Long-bodied and territorial fish need far more room. Always research each species' minimum tank size — check our species database for verified care parameters.