Venting is recommended especially if there's a sump.
My stand for my 45g cube is vented with 2x Cougar 120mm fans from NCIX. I bought a 4 pack of Cougar fans for $20 - 1200RPM 60.4CFM 17.7DB.
Since the cube is in the main part of our open floor plan, I'm running the fans at 9vdc vs 12vdc to run them even quieter.
I hope this helps!
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