first time with a calcium reactor

[Fesso]

Alright, so I have set up a new tank. It's about 130 Gallons... 80x20x20. I used rock from my old tank and a bunch of live rock I bought that I cycled in a Brute until the tank was up and running. I put my livestock in a few days ago and everything is dandy.
I have a mix of sps (some colonies but mostly frag(ish) pieces) LPS, Zoas, a clam ect...
Parameters are all kinda low
Calcium - 330
Alk - 7.7
Mag - 900
Not sure what's going on with those numbers. The salt was mixed in the tank(empty) 10 days ago and I added the rock a week ago.... corals a couple days ago.
Could it be that the Reef Crystals was a "bad" batch? I did have a fair amount of sediment after mixing the salt. I assume calcium precipitation, but it wasn't too drastic...
Anyway here's my question. How fast should I get the calcium reactor online. Do I need to bring my levels up a little before bringing it online like I would before using kalk? Any tips?
I have a GEO 612 Calcium Reactor, I still need to clean it and get the tank filled. Should I be in a rush?
Thanks
I am going to post some of these questions in my build thread too.
http://www.canreef.com/vbulletin/sho...d.php?t=109767