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I assume your measurements are in feet. Also I assume you are giving length x depth x hight. If so the calculation is 48"x 24"x 12" divided by 231 which is approximately 59.84 US gallons. if the tank is filled to overflowing. If you allow for the 1 inch or so that is at the top and never filled, you would have to calculate 40"x 24"x 11" divided by 231 which is 54.8 US gallons approximately. If you further add gravel and rocks you would have to do more similar calculations to get your actual water volume. Then, if you wish to be successful, and give yourself a chance at keeping your fish alive, you will supply the following necessities :- 1 inch of fish needs a minimum of 1 gallon of water. :- Every tank needs a fully cycled filter running permanently. :- Every tank must have 50% of its water replaced every week. Follow the above rules and your fish will stand a chance of survival. Fail to follow them and I can guarantee that your fish will have constant health problems.

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Aarnav Nayak

Lvl 5
1y ago

What else can I help you with?