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What do I think?
The volume of my tank is in gallons: 50G
Length, width and height of my tank: 45 1/2”L x 11 1/2”W x 17 1/2”H

After calculations:
The actual volume of my tank in gallons: 39.64G
The actual volume of my tank in litres: 154.2L


I used the calculator at:
http://www.firsttankguide.net/calculator.php



I always though my tank was only 18" tall because that's what was advertised. 20" should be a 55G, but the ad clearly said 50G (Petsmart)

These are my inside dimensions (how much water will actually fit inside)

Edit: I mis-measured the height of the tank because I measured behind the trim with cm instead of in.
 

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From what little I have seen of acrylic tanks, the walls seem to be much thicker than those of glass tanks. When I calculate the outside dimensions of my 50G I get something like 46G, but when I do inside I get about 39 1/2.

Thats 20% less volume than the "advertised size." If his walls are much thicker than mine, say 1/2" instead of my 1/4" then that could explain the additional loss of volume. His loss is about 30%, so it isn't much more loss than mine. One would also have to consider how his built in filtration is set up and whether or not it was calculated in the tank's "advertised size."
 
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