I want to thank everyone who has replied to my posts. I have learned a lot here and your collective advice has helped immensely. I had aquariums years ago when cycling and tank sizes were not discussed. Filter media was like a box with "angel hair" and carbon that you loaded yourself. I have learned so much about ich and the invasive nature of chemical meds especially for sensitive fish. Never tried salt and heat before, but it saved the day, for at least one fish! And fresh water changes with no chemicals saved my poor dojo! Thanks so much Shirley