mm.. don't need to worry too much about coral releasing toxins.
I have a 1 inch crown trigger in my tank. In it's first day in the main tank, fishes tail is in it menu. And all my corals, it will also bite a piece off.
One week in the main tank already still try to get my doctor shrimps. Below yesterday photo, antenna stuck on it mouth whole day, serve it right. I check my 2 doctor shrimps, lost some of it antenna but body not harmed. Today the antenna at the trigger become thinner and gone.