I prefer uncovered. I like being able to just stick my hands in the tank, do what I want to do, then wash and be done. Lifting a top isn't hard, of course, but seeing the tank wide open makes it seem more inviting. And if the tank is unheated or you have the filter outflow low enough, you don't have to top off the tank that much.
If I'm worried about fish jumping, I glue strips of plastic canvas around the rim of the tank to make a fish fence. Ugly, but effective.
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