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You can seal the top of the tank and reduce evaporation... but the cost is probably more than the gain. You'll have a harder time controlling temperature, and you'll have a much harder time controlling the ph, which is an even bigger concern. The water in your tank needs to exchange gases with the open air: trapping it in there can risk buildups of CO2 and lack of 02 in the water.
imho, the only real reason you'd want to cover the tank is to keep jumpy fish from jumping out of the tank.
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