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 FWIW, the 9 months of winter we get around here is usually when my tank does its best, despite that I probably have the windows open much less of the time. 
 My guess is as long as you have good ventilation overall, it's probably not a huge concern.
 
				__________________-- Tony
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee!
 
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