Ive had mine for a couple months now, and she seems to be doing really well (though Im reserving final judgment for a few more months at least).
1) She hasnt nipped at anything other than algae. I have a wide variety of soft coral, euphyllia, zoanthids, chalice, lobophyllia, dendro, etc. I have not tried her with a clam though.
2) Average temp is about 78.
She is fairly shy, though not nearly as bad as she was initially. Currently housed in a 240 with about 400 pounds of live rock, which gives her Plenty of caves and hiding places to feel secure. The only other fish in there are a pair of Odontanthias borbonius, and a trio of Banggai Cardinals, so aggression is minimal too, which Im sure helps.