hi all, need help my two large Xingu's have hole in the head ,and have a kelberi that doesn't have it but its in the same tank ? I've done three treatments over 4 weeks one using esha hexamita, and two using octozin but both xingu's still have it , still feeding like mad doing two 30% water changes (hma) a week. Am I missing something is there a better treatment I can use really need to sort this out .