I tried treating mine and it just got too stressful for me and I have an avian vet close by. She got antibiotics and it cleared in about a week. Just in case a vet is an option. Several people here also swear by painting with colorless iodine. You can get this at Wal-Mart in the human foot fungus treatment section. I tried asking at pharmacies and no one knew what I was talking about. It's not in the iodine section but in the toenail fungus section. Good luck with your ducky.