I don't know about that - I understand they have very sensative tails and can turn on their own tail or so some of my not-so-brilliant-in-the-moment dive buddies can attest to...Good luck with your tagging operation at Owens Beach. You should have a different tagging system than the Aquarium so why don't you just use those Sharpies and name each Sixgill (write fast!)? Maybe it would be safer to name them on their tail.
Maybe I would have a better chance distracting them with my dive buddy and slapping an SD sticker on their back - oo hey GG do you have a dive buddy picked out yet?