I’ve always heard sargassum triggers are generally reef safe. I don’t know if that includes shrimp and stuff, or what...or even how accurate that is. Does anyone know?
You can find one every now and again that has eaten a shrimp or something, but so do zebrasoma (tangs), rabbitfish and many other considered reef safe but can eat coral when they get larger. IME, these are more reef safe than tanks or angelfish (except for Genicanthus).