A rule that applies in general to diving is to not touch anything or disturb anything, some of the scenes like 5:35 are unpleasant to see. Chasing a lot of fish, making them anxious is just not okay in my opinion.
I brought bags of bead into the water, it was a totally pleasant experience to the fish, they never got enough. They would swarm you by the hundreds till you were out. I still think that was a unique experience . We even would drink beer underwater while snorkeling.
People like myself come from all around the world to dive there. Yes they call it a Parrot fish there. In Key West we call it something completely different like the Giant Grouper's nickname I would be blocked by moderators to write here. It's proper name is: abcnews.go.com/US/massive-goliath-grouper-snatches-shark-single-bite/story?id=25076840