Hi Dan,
 
 DL>    It would not be too hard to give dual MM and inchs for sizes,
 DL>    we already have Liter bottles of soda, water and such, with in (  )
 DL>    the amount in ounces and such.
 DL>    So you could well see a tank with the Inchs and in (  ) the  MM
 DL>    size.
 DL>    All a matter of labeling things.
 
Yes. Its not too bad when your buying a new setup, the real fun starts when 
you've been in the hobby for years, and decide to put /that/ lid on /that/ 
tank with /those/  tubes, and /this/ UG plate! Wait till you've tried it!!! 
It can be very irritating!!!
 
All the best,
 
Adrian...
--- GEcho 1.20/Pro
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