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I assistant professor this the hard way. A few years back, I snagged what I thought was a 55-gallon "breeder" tank from a garage sale. I eyeballed it. Squinted a little. Looks once 55, right? I treated the water for 55 gallons. I bought a heater for 55 gallons. Two weeks later, my ammonia levels were spiking like a caffeine-addicts heart rate. Turns out, the tank was actually a strange custom 42-gallon European build. I was overstocking and under-filtering because I was too lazy to reach the math. Don't be behind 2018 me. Use a well-behaved aquarium water volume calculator volume calculator past you even think just about buying substrate.