pakistan butterfliefish reef safe ? (help)

[rick17]

I was at my LFS and heared the owner talking whit a client and he told the custumer that the pakistan butterflie did the same job as the cooperban (eats aiptasias) and are reef safe he does have a couple of paki in is show tank is this true.
I know that it could be a hit or mis for the reef safe part but will the paki be more of a risk my aquarium is mostly softies and lsp (zoo,ricks,hammer.....)
does anyone have had some experience whit pakistans in there reef

thanks rick17