Sump water evapourating fast

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Sure your not just noticing the water loss due to the sump having whatever % less surface area then the display. If the sump surface area is half of the display surface then the water level in the sump will appear to drop twice as fast. Just a thought.
 
You are better off dealing with lots of evaporation than a lack of gas exchange. I would not put a lid on it.
 
I lose about a gallon a day on my 100 gallon. It's perfectly normal. Deff thinking about investing into a auto top off system! In the meantime I'm just filling by hand. So I feel your pain buddy!
 
Yes a lid will help.
If your tank tends to run hot, you might NOT want to lid it though.
(The evaporation actually cools the water a bit.)

It would make a noticeable difference in evap rate, but not a HUGE difference (in my experience.) if you loose 5 gallons a week with it open, you'd probably still loose 4 gallons a week with it loosely lidded (and it needs to be loose fitting to allow the aforementioned gas exchange.)
 
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