At Half Moon you have to go to the left side of the beach area along the rocks and out to the jetty to the rope. We didn't see many fish until we swam out there. Once there we saw lots of fish. There is a nice corner formed by the rock jetty that had a soft sand bottom that is a nice place close to the fish to rest. The fish seem to school at the end of the jetty, even saw Baracuda and Pipe fish.
We loved the entire Half Moon experience, and plan to go back on the Glory next year!