I see no problem with that. Mine got along fine with my dragon wrasse until it got ich and died....so im assuming they would be fine with any other large wrasse.
I keep a tusk with my paddlefin wrasse with no problems, a coris will get bigger than a paddlefin though. I wouldnt expect aggression from the tusk, there are a few coris keepers here, hopefully they will be able to add something
I kept my Tusk with a Bird Wrasse for a while till the Bird got ich and died in HT. I currently have a Red Coris growing in a 75 QT and will be adding another Green Bird soon.
So my long term is the Tusk, Green Bird, and Red Coris in a 240.
I think you will Not have any problems. My Tusk is Not aggressive and my Coris lives with Damsels no problems.