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If you open the lid the evaporated water will humidify the air instead of condensing on the lid with at least some of it raining back into the tank. The salt doesn't evaporate. So you only need to add fresh water for top off preferably ro/di. After a period of time some salt may be lost to "salt creep" Salt deposits on and around the tank. This circumstance makes it neccessary to check salinity and add a little salt water from time to time.
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Tom
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