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Aquarium volume calculator Calculate your aquarium volume in gallons and liters from its dimensions, with net water volume after substrate and glass, and the total weight of the filled tank. Fish compatibility checker Check whether freshwater fish, shrimp and snails can live together: water ranges, size and predation, temperament, fin nipping and invertebrate safety compared. Stocking calculator Estimate how many fish your aquarium can hold based on adult size, minimum group and minimum tank size of each species, not the old inch-per-gallon rule. Heater size calculator Find the right aquarium heater wattage for your tank from its volume, room temperature and target temperature, and learn when to use two heaters instead of one.