a 37g tank is 24" high? if its 18" deep wouldn't that make it 20" wide?
According to All-Glass:
http://www.all-glass.com/services/techinfo.html
a 37 gallon tank is 30-1/4 x 12-1/2 x 22-3/4 (LxWxH).
Leigh
http://www.fortunecity.com/lavender/halloween/881/