+1 on helping cool the tank.
You can try covering the tanks with glass.... that usually slows it down.. but then also brings your tank temperature up. (Especially when the ambient temperature goes up)... reduce splashing.. etc..
Evaporation is part of the hobby. Do a quick search on ATO or Auto-Top-Off. You'll find a bunch of solutions that people do to keep their tanks at the same salinity.
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