My plan is to QT all the new wrasses together and add them together when the time comes. The isosceles shouldn't be able to harass them all.I have had an isosceles then added a brunneus with no issues. My isosceles died and I added another one down the road with the same brunneus and no issue again.
I've got a Yellowtail Tamarin in QT right now and will have a Redtail and new Potter's in QT early next week. Then, if the snow would stop I can pick up my brunneus and get it started on QT as well.