Salinity questions

Take out a gallon of SW and put in a gallon of RO/DI. Repeat over the course of a few days, not all at once.

How high is it?
 
In the past I've mixed my new water with a slightly lower S/G and lower the tank S/G over a 3 to 4 week period with weekly water changes.
 
I have a 140 gal. reef. I changed out 5 gallons of tank water with 5 gallons of fresh on a daily basis until I got it where I wanted it, and I did not have any problems.
 
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