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Unread 10/06/2017, 08:16 AM   #3
mcgyvr
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Join Date: Sep 2003
Location: North Carolina
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Yes adding a top can certainly reduce evaporation..
However.. realize that gas exchange (oxygen/nitrogen,etc...) is pretty critical in aquariums so there is a point where you can be causing more problems than you are solving..
But if you have a sump with a skimmer down there then thats likely enough exchange and you can slap a lid on the tank..

I'm not sure if there is any real data/experiments on how tight a lid can be before it causes problems..
I always run with no top and just accept evaporation for what it is..
Evaporation also helps with removing heat from a tank (if thats an issue) and reducing evap will increase temps


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