Based on my experience:
Bluethroat, Sargassum and that family of triggers are reef-safe. Niger triggers tend to be reasonably reef-safe as well (at least towards fish and corals, not inverts). Stay away from Queen & Clown triggers - can become very voracious and vicious.
The rabbitfish will outgrow a 90g fairly quickly. A Kole or bristlemouth tang is smaller and slower growing, yet just as good for algae control in most cases.
Hawkfish tend to be fine except with the smallest fish, like little chromis. Large chromis and small hawkfish should be safe.
Anthony
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