First things first, you need a Florida saltwater recreational fishing license.

Those can be obtained here.

http://myfwc.com/license/

 

Also of note is the ornamental bag limits page and IMP (indigenous marine protected) listings. Don't be collecting those Bahama stars!

That list is here. http://www.eregulations.com/florida/fishing/saltwater/marine-life-regulations/

After any number of days collecting,  a single person can only have in their possession a total of 40 animals. That means a maximum of 20 neon gobies or blue chromis. Some fish, like angelfish, have special limits. I think that you can only have a maximum of 10.

There will be times when you find a tiny blue angelfish but realize that minimum size is 1.75 inches. Our masks make things look bigger but small (<1") angels and especially butterflies are difficult to get eating and starve very quickly. Also, realize that things like snails and hermit crabs count towards your bag limit.