when 10 does not equal 10
You also have to remember that a 10 gallon tank does not hold 10 gallons of water. That "10 gallons" is based on the outside measurement, you have the glass thickness, the gravel depth, the space taken up by decorations, plus whatever could be added until it overflowed.
I assume my 10 gallon tank holds about 8 gallons, based on measuring water changes.
You also have to remember that a 10 gallon tank does not hold 10 gallons of water. That "10 gallons" is based on the outside measurement, you have the glass thickness, the gravel depth, the space taken up by decorations, plus whatever could be added until it overflowed.
I assume my 10 gallon tank holds about 8 gallons, based on measuring water changes.
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