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'.
I live near Ocala. We don't have weasels here in Florida but have most every other predator. I have electric wires around my coops and pens, my pens are covered with good heavy duty netting and I have concrete under the gates, all due to losses from predators in the past. Everything loves chickens. Some predators will lurk and look for an opportunity. Here most of the predators roam at night. I have several game cameras up around on my property. I have been surprised at the predators that roam at night. Some predators I can recognize because they have noticeable injuries or markings and seem to have routes and routines. You usually will never see them. I haven't had issues as other people have. I have seen coons on my game cameras but they haven't messed with my birds yet. In the past I have free ranged but my land is mostly open pasture with no places to hide. I had a hawk kill a bird that was with me in our blueberries, right in front of me. It happened so fast. The hawk killed her but didn't take her. I have lost too many birds in the past free ranging, but my birds all have nice large covered pens. When you free range that is the risk you take. I use welded wire with chicken wire. So far so good. Good luck...