Glass Tops

Stupid Newbie question here.
If I leave one of the tops open, will that create more oxygen or do I need to add a powerhead?
Leaving one of them open and pointing a powerhead towards the surface to break the surface tension will promote better gas exchange and help keep the tank cooler.
 
Probably need a power head but... what do you have for flow now? What size tank? What's your stocking plans?
 
I personally prefer to leave it closed and still run a powerhead aimmed up. Fighting evaporation is certainly no fun at all.
 

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