So I put 5 ghost shrimp in with my F8, Hula, after a week's QT. I thought it would be fun for her to be able to hunt and feed as she pleased for a couple days. I watched her track down and gobble up one of them, then she went on her merry way and I left the room.
Came back an hour later to 4 decapitated ghost shrimp, heads and body parts scattered all over the sand, and one smug-looking puffer swimming around happily. Seems that even if we're not hungry, those shrimp MUST. DIE. NOW.
Yo ho, yo ho, a puffer's life for me.