Welcome from MS.
I used to live in St. Pete and went to school at USF in Tampa.
A buddy of mine used to own a dive shop in Tampa and we would take advanced students out to Crystal Springs in Z_Hills for their first night dive.
All the freshwater eels would come out. It was pretty cool and safer than doing their first night dive in the gulf.
Is it still open? This was the early through mid 80's.
I know the eco groups had been trying to shut down access.