At the end of September after a regular tank clean , I forgot to plug the heater back in. That was a Friday, I did not realize this until the Sunday morning when I turned lights on to see two fish completely covered in ich
without a qt tank handy I immediately bought some garlic. I soaked the food and fed 2-3 times a day. The good news was that both fish were eating.... After aproximately 2 weeks all signs of the major infestation were gone and I have not had a recurrance. Good luck..