You might also try making "sugardine"...mixing sugar and 10% iodine or betadine, it will mix to be the consistency of honey. Cover generously and wrap his hooves with some cotton and vet wrap. It will draw the infection out and harden the hoof. The most recent studies have shown sugar has some antibacterial properties in itself. Also works great for abcesses.
Noticed that no one has made suggestions about the root of the problem. Thrush is a bacterial infection and while we can treat hooves and clear it up, if we don't treat the ground it will just find it's way back. We treat all of our stalls, both arenas and common areas (in front of the barn, barn aisle, round pen, around the stock tanks and around the large tires we feed hay out of outside) 4 or 5 times a year. You can use a solution made specifically for it from a vet supply company or go to your local hardware store and get commercial grade lysol, it is a stronger grade made for hospitals. Spray everything down good and be sure to allow it to dry well before putting him back on it. It also makes the barn smell lemony fresh and spring cleaned :)
Good luck, hope he heals fast and you are back to riding soon!