Hi Dan,
 
 DL>   You have a point, but it is not that simple, theres  for example
 DL>   20 Gal Highs, and 20 gal  longs, refering to
 DL>   a tank thats higher then long and so actually has less surface
 DL>   (water/air), then a 20 gal Long thats less high and much longer.
 DL>   Don't have a Gallon to liter  formula handy,
 DL>   but simply converting gallons to liters is  useless
 DL>   w/o indeed knowing tanks dimensions.
 
I've had a number of response to the question I'd asked. Phil Arnold sent me 
a table of volume and dimensions, and yes, that mentions the high and long 
business.
 
 DL>   People talk of a 20 gal tank,  even here  we have to wonder
 DL>   is it a high?  a long? a what? ;-)
 
So why is it done like that in the US?
 
 DL>   It can even be a octagon type.
 
!!!!!!!!! ;-)
 
All the best,
 
Adrian...
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