Good replies about critter-proofing your run. Consider adding a hardware cloth "apron" around the entire bottom edge of the run (research it more on BYC) for the digging predators.
On another note, you mentioned your coop is a shed with "a window". In FL, sounds like you might want to (a) add more windows, or extra ventilation due to hot temperatures. Be sure to overlay screen with hardware cloth on the windows, and (b) consider a roof extension or overhang for shade, if the coop is in partial or full sun. Just sayin'.
On another note, you mentioned your coop is a shed with "a window". In FL, sounds like you might want to (a) add more windows, or extra ventilation due to hot temperatures. Be sure to overlay screen with hardware cloth on the windows, and (b) consider a roof extension or overhang for shade, if the coop is in partial or full sun. Just sayin'.