Haven't kept one, but I've been around a number of them. I've never observed a foxface to do much damage to SPS other than the stray nibble...kind of comparable to a coral beauty in that most foxfaces will probably leave them alone, but the stray individual might be a PITA. But, I *have* noted that foxes do nibble on zoanthid polyps quite a bit, and they aren't too far off the taxonomic ladder from a BTA. I'd say give it a shot, but proceed with caution.