I just completed the 4th tank transfer over 12 days for a flame angel with ich. The Angel had a several spots that are all gone except for one. This same spot has persisted over the course of the treatment. Is it possible that this single spot is not ich. I have taken the fish out and viewed it in a clear container. The spot is white but it does not appear perfectly round. I have also been treating with PraziPro over the course of the treatment. At this point should I continue doing tank transfers. I have performed this method with several fish already with great success. I have also considered just doing a fresh water dip before I add the fish to the display. Any advise would be appreciated. Thank you.