Water Change question

[andsoitgoes]

It's in a nice dark place, and the lid WAS on until I accidentally knocked it off =/

It's in my closet, far in the back It's got a heater so the temp is stable, I do know that the salinity was a bit higher, but I've added RO water to balance that.,

I've understood that things like the calcium in the salt can evaporate out with the water, which was my concern with having it cycling so long. Maybe not?