best thing before adding fish to your new tank is find a compatibilty chart before adding each spicies.your wrass will be quite aggresssive from make sure other fish are large enough to handle the wrass but also not as agressive as the wrass.volitan I think you mean as in lionfish?
I'd add both about the same time if possible. Make sure your wrasse (not a fairy) is about the same size or bigger than the lion. In fact, make sure ALL your fish are bigger than your lion.
Good Luck!