No idea about the area that you're in. But you can't swing a dead cat in Key West without hitting a shark. But every single one of them was harmless. Never had any trouble at all.
Lemon shark -ran as fast as it could. I've had lemon sharks do a close fly-by, but they don't usually stick around.
Bonnet head shark- eyeballed us then took off, most just jet away at lightning speed as soon as they see us. Never seen.
Nursesharks- let us hang out for a while together, then left Nurse sharks normally just hang in their own spot the reef and I rarely see free-swimming. One notable exception was one that stalked us over a fish.
Yellow ray- let us hover over it for a while and then left.
Hammerhead- really shy, except for Tampa Bay. I ain't ever diving there. Never seen. Do you have a personal experience with a hammerhead in Tampa Bay to share?
Bull shark -I got one to wiggle his pectoral fins at us once. That means: Go away or I bite. That was the only one that didn't jet as soon as it saw us. I don't like bull sharks, but this is based totally on reputation. I've only seen a few, and none of them have ever paid us much attention. If part of the group is spearing however, they are not bashful to try and compete for the fish.
Giant brown ray- was hidden in sand right under me while snorkeling at Fort Jackson. When I got bored and turned around, he flicked the sand off and fluttered away. He had to be 6 feet across. Looked like the whole bottom of the ocean was coming to life.
Moray eels- look don't touch, pretty much never seem to move at all
Cool experiences every time. Sharks are the least of my worries. Making a scuba mistake, or getting my head taken off by a boat, or getting left behind with no buoy or land around, are my major concerns.