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I'll be the odd one out:
It depends on the fish and the setup whether a lid is necessary or not. I have a lowered waterline so I can have semi-emersed plants grow over the rim of the glass. Just for safety reasons (I have pencilfish), I have a jumpguard made of fly screen on top instead of a closed lid.
The evaporation in my tank is high anyway due to the pothos and floating plants. Open or closed doesn't change much for me.
The first thing that comes to mind immediately is the tank is breathing better.There's no reason to not have a lid on