toto - replying to your email.
It's been eventful at Esmeralda recently. Seashell's clumsy nurse sharks (!), then a whale shark a few days ago, followed yesterday by an impromptu wreck dive.
I've been arguing about our nurse sharks recently with someone on Scubaboard. I maintain that we have nurse sharks that are simply friendly and want to be made a fuss of, whereas the other person (who hasn't been here) refuses to believe it's anything other than human abuse of sharks. Seashell's observation is interesting and supports my case.