I recall my first "big" tank. It was a 55-gallon long I found at a garage sale. I was convinced I could fit a little army of Neon Tetras and a couple of Angelfish in there. I did the mental math. I used the old-fashioned "one inch of fish per gallon" rule. Its a classic, right? sum disaster. Within two weeks, I was battling a nitrate spike that looked subsequent to a chemistry project with wrong. My fish were gasping. I was panicked. That was the morning I realized my eyes are awful at estimating volume. Now? I dont even purchase a sack of gravel without pulling out an aquarium knack calculator.

It sounds overkill. I know. People say me, "Its just a bin of water, just occupy it up." But it isnt just a box. It is a biological pressure cooker. If you acquire the numbers wrong, all else fails. Here is why the tank volume matters more than the glass dimensions.

Most people see at the sticker on the tank. It says 20 gallons. They think they have 20 gallons of water. They don't. You have to account for the substrate displacement and the hardscape volume of aquarium calculator. I later measured a 20-gallon "high" tank. After calculation two inches of fluorite sand and a immense piece of Malaysian driftwood, I actually lonesome had about 16.2 gallons of water. That is a all-powerful difference.