I thought sebaes have a purple tip? I don't know too much about corals since my tank's fowlr, but either way, I'm glad you are nursing it back to health. If it grows and looks like a bubble tip, then you'll know if the LFS was really full of fishpoop and just trying to cover themselves. Or maybe the manager really doesn't know what you have and is just taking a shot in the dark. Keep up the good work!