sump lids

[winzig]

So I was wondering what the consensus is about putting a "lid" on my sump to help with evaporation and to keep dog hair and such out of it?
Would a lid not allow for much gas exchange or would it be ok?
Any advice or opinions would be great.

 

[B&CinB.C.]

My IM75 EXT came with clear covers for the 3 sections of the sump

 

[Skippy The Meh]

I assume you have a skimmer? If so just plumb a fresh air intake hose to it. (Can also run the air intake through a CO2 scrubber.) You can always try and if you see PH drop, youll know gas exchange needs to be fixed one way or another.