Do you mean the water will always be fresh? If so, your corals might starve. Your water will basically have no microorganisms.
Also risky as the slightest difference could affect your salinity. Say if left alone for a few hours and the salinty drops by .01 per hour. It is scary. Theres no way to know how much your water evaporates. Too many things will affect it. Its as if youre doing a weather forecast.
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