oh no! I've been following this thread and praying for Gus, and I am so sorry to hear about his passing!
I'm a little teary knowing that he's gone when so many people here were trying so hard to help him get better- truly, everyone on the forums here really does care about all of our little fuzzy children. It's great to see the support but heartbreaking when nature decides it's time.
Poor little Gus, he had a hard time there at the end but he's bouncing around again somewhere I'm sure. You tried your best, and he knew he was loved.