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Rimless are pretty, but I cover my tanks for both fish protection purposes and it dramatically reduces evaporation. It reduces light a bit, but I have to dial down my LED's anyways. With a larger tank auto topoffs negate the evaporation issue, but it gets less practical with smaller tanks.
Again, I love the look of rimless tanks, but I know a lot of rimless owners that as soon as company leaves and they are done impressing a cover goes over the tank.
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