So sorry for the late reply.
They are doing fine now. I was wrong about the eye. He has both of his eyes. He had this eye goo and I thought it was a dangling eyeball, but it wasn't. Bad lighting and I couldn't catch him. He had bloody eyes and I washed them with lukewarm water. Right now he is fine. Happy and normal as he used to be. Eyes seem totally fine.
The pen issue was mostly my fault. That coop has been there since before I was born and the wire was never changed. For about ten years or so, nothing lived in there. Before I moved the ducks to that coop when they were little, I checked it and patched up any hole I could find. The raccoons had torn through the chicken wire to get in. They had been living in a log pile right next to the coop. I should have removed that a long time ago, but like I said, we had never planned on raising ducks or even chickens again. That all has since been taken care of. I am putting up new wire. Half inch metal cloth. It's a work in progress. Right now they are staying in a big metal workshop we have. They have their water, nests, food, and a fan and lighting. It's not that hot in there, but they're as safe as they can be.
I will be looking into the electric fence. Right now I'm working on patching up everything. Washing the raccoon blood out. Getting a lock on the gate. Getting some sort of lighting situation out there. It used to have electricity, but it doesn't at the moment. But they're all fine. We're getting some new babies soon, so I'm trying to get everything varmint proof now.
Thanks for all the helpful tips and suggestions. I appreciate it.