Scott Michael, in his Marine Fishes book, says Heniochus varius "Will nip at some sessile invertebrates, including stony coral polyps." He doesn't make comments on pleurotaenia but I would think their similarity may suggest the same would be expected of them. He gives them both a "special care" aquarium suitability rating. Incidentally, this would be a great reference book to answer such questions for you.
[ December 02, 2001: Message edited by: livingstone ]
[ December 02, 2001: Message edited by: livingstone ]
[ December 02, 2001: Message edited by: livingstone ]</p>