Finpado calculates freshwater aquarium volume, substrate and water changes; provides sourced fish references and checks, and lets you save, compare, print and share plans on your device.

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Finpado helps freshwater aquarists work out how much water a tank holds and organize plans before adding fish. Enter inside measurements for rectangular, bow-front, cylindrical, half-cylinder, corner or hexagon tanks; the planner estimates net water after subtracting substrate and decor, and can record filtration and water-test readings. Browse fish references with sourced care details, then review checks for measurements such as temperature, pH, hardness, group size and tank dimensions. These checks flag points to investigate; they do not certify that fish are compatible or that a tank is safe to stock. You can also calculate substrate volume and weight, plan water changes and bucket trips, and estimate how a change affects nitrate. Save and compare plans in your browser, or print, export and share them. Finpado also includes tank-size charts and explanations of the volume formulas. It runs without an account, and tank details and saved plans stay on your device.

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