How fast does you water evaporate?

My 5 gal goes down about 3/4" every 2 weeks and my 20 gal hex only goes about 1/2" every 2 weeks but we have a whole-house humidifying system on the furnace. I keep the humidity pretty high to keep us all from getting the dried out noses in this sub-0 weather.

itZme
 
About 2 gallons a week, which is about an inch. This is with a very long bubble bar and a strong power filter.
 
It's got to be about an inch a month although I have a purpose built marine tank and I keep tropicals there is such a big gap the was made for the filter it just evaporates out the back of my tank and it ruins my wallpaper!
 
I typically lose between 1/2 and 1 inch per week in my 35 gal. 90% of the time I forget to close the lid all the way, so I lose closer to the inch side.
 

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