Personal experience...auriga and ulietensis will eat anemones...and downright devour them (at least condy and BTA). Copperband didn't touch any large anemones. Yellow Long Nose also didn't seem to show interest, but I didn't have him too long, so can't say for sure.
hth
PS - I also agree that you may have problems if you have clowns hosting in the anemone, as they may get especially aggressive towards the butterfly.