Lets be honest for a second. Weve every been there. You stand in tummy of your glass box, staring at a bottle of expensive liquid fertilizer or a tiny vial of ich medication. The label says "5ml per 10 gallons." You see at your tank. Is it truly 10 gallons? You bought it as a "10-gallon starter kit," hence it must be 10 gallons, right? Wrong. This is the moment where most hobbyists make a mistake that leads to a cloudy tank or, worse, floating fish tank calculator. You absolutely need a Quick Aquarium capacity Calculator For truthful Dosing because your eyes are lying to you.
I scholastic this the hard way urge on in 2018. I had a pretty 29-gallon planted tank. I was dosing Glutaraldehyde to execute off some unbending BBA (Black Beard Algae). I calculated based upon 29 gallons. I forgot that I had three inches of muggy aquarium substrate and approximately twenty pounds of seriyu stone. Within twenty minutes, my Cardinal Tetras were gasping at the surface. I had overdosed them by approximately 25%. Why? Because my actual water volume was barely 22 gallons. Thats a loud gap.
Why Your Tank Size Is Probably A LieWhen a manufacturer sells a tank, they pay for you the outdoor dimensions. They don't care approximately the glass thickness.