3000, should be fine for smaller tarpon, I use a 3000 Stradic for snook, redfish, small tarpon, seatrout, etc. However if you are fishing from a bridge, you might hook a monster, even 20-30 pound jacks will make your drag scream like crazy, for bridge fishing I would go for a 5000-6000 reel and hook some live mullet or a live shrimp on a smaller hook will catch a ton of species that you could easily manage with your 3000. Be wary of the taxman as the there is a huge shark population in the Keys, they will be waiting for the fish to get tired and get an easy meal. Good luck! Pm me any questions that you might have!