where to begin....
In my opinion, at this point the salt level should be the least of your worries.
You're saying you've got fish in a 3 day old tank? That should be what you're worrying about most....a 3 day old tank is not going to be ready for fish.
The first thing you should do is read read and READ on here....especially all those "starting your first reef" threads and stuff like that, which is stickied to the top of the New to the Hobby forum.
oh, and...
[welcome]