You find out your 75 gallon tank that you have had close to 3 years is really a 90 gallon tank!!!! :?: :!:
Betty said:Same footprint, only taller?
I guess that shows you don't have to be too exact with your measurements of dechlorinator.
It wouldn't be good to not know how many gallons if you were treating with medication though.
dmopar74 said:LxWxH in inches divided by 231 will give you gallonage pf your tank. If you want to get depressed measure the interior dimentions and actuall water height.