A good friend, long time San Pedro diver and photographer, says:
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I'm more into common names, but I know of sightings of the following:
gray reef sharks
blacktip
bull
hammerhead
lemon
dusky
whale shark
There are no good spots to see them. You just get lucky, or you don't.
This ain't SeaWorld.
Most sharks are not territorial, so they tend to move around, making sightings irregular.