If it were me I would go with a combo of either:
triggers, eels, tangs, harlequin tusk, and angels
or
sharks, eels, lions, harlequin tusk, and tangs
A 90 limits your sharks, however, as only a coral or marble cat shark would remain small enough (avg of 40-50cm). Still smallish for a shark, but published sources specify a 70 is adequate for these particular species.
A puffer would also work in the first group, I just don't like puffers that much. Remember, no puffers, triggers, or angels with sharks, and no lions with triggers, generally speaking of course.