Because its not the most aggressive fish. The clown is, followed by the gramma.
Maybe, maybe not. You need to rearrange the rocks and keep the clown and gramma separated from the tank.
You said that you just added the wrasse from it's quarantine. Why can't you set that back up?
it was a disaster attempt at a QT. couldnt control the ammonia levels, dont have time for water changes every couple days, etc.