i wouldn't think so, but if they were sleeping or sickly it could very well be..
did they have a host anemone?
to add to the list:
planktonic feeding butterflyfish. like pyramids, zoster's, declivis, tinker's, aya, schooling bannerfish, and longnoses
did they have a host anemone?
to add to the list:
planktonic feeding butterflyfish. like pyramids, zoster's, declivis, tinker's, aya, schooling bannerfish, and longnoses