Wait until the cycle is complete since you can kill off the crew while it is still cycling and the fact that there is little for the crew to even clean up till it’s done. A couple of red/blue leg hermits along with a couple of Nassarius snails would be good to start out. After a couple of months you could get a shrimp if you want.
Edit: also if you haven't already I'd read all the articles at the top of this page.
http://www.aquariumadvice.com/showfaq.php?fldAuto=2