1984-1987 was the official introduction by the FWC. over 20,000 were released into 3 canals(claimed ocellaris but most likely ocel/mono hybird) 3,000 orinomensis). C-4 , C-103 , C-102.. yes, they started showing up afew in the 60's along with the wave of other exotics.. they have done an awesome job getting rid of the exotics. you will find hardly any spotted tilapia or oscars were peacocks are plentiful unlike across the everglades into naples where peacocks are few and far between yet cichlids and oscars are everywhere like bluegill.. One thing i find interesting is they really don't like mayan cichlids.
I go down there no less than 5 times each year.. if you want to know some great spots where you don't need a boat PM me.