You should add fresh water to account for the evaporation. Don't do a salt water change until the cycle is complete.
If you have livestock in the tank, you could do a water change to keep Ammonia down but it will prolong the cycle. Should wait until after the cycle to add livestock.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,