I think that I may have made a big mistake

I bought a Coris Wrasse today at my l.f.s. with the assurance that they are peaceful and won't bother any of my other critters. After looking on line I'm finding that this may not be the case. Has anyone else had any experience with this species? I hope I haven't just bought a monster to be . At this point he's about 1/2 inch long and still a juvenile. Will I have some time before he starts exhibiting his aggressive tendency or should I just let him live in my quarantine tank? Tank he was supposed to go into is a 90 gallon reef with r.b.t.a 2 rock anemones, stalked xenia, creeping xenia, laminelia, colt coral, various polyps, zoo's, crinoid, yellow cucumber, brittle star, feather duster worms and clean up crew for inverts, The fish include 1 tomato clown, mandarin, 3 pajama cards, bi-colored blenny, fire goby, royal grama and last but not least a couple of mollies.
please help and thank you in advance I know it was DUMB.
Chris

Ok, Just an update disaster averted my lfs is going to take it back tommorow. Just thaught that I would let you all know.
Chris