Canker, also called frounce, is Trichomoniasis. According to the AAAP Avian Disease Manual, treatment is 30mg/kg metronidazole once a day for 5 days. You can buy metronidazole as Fish-Zole (250mg metronidazole tablets) or Meditrich (100mg metronidazole tablets).I'm pretty sure canker and thrush are the same thing. Thanks for the info about the Nystatin, I saw that somewhere before but couldn't find where to get it.
I ordered thrush medicine from Peter Brown the Chicken Doctor (www.firststatevetsupply.com). Not sure what's in it.
Thrush is yeast and is treated with antifungals like Nystatin.
-Kathy