Flag tail are not bothering it at all, I have had problems In the past. when my water was very acidic I did have an issue with that ,but now that my PH is higher they seem to leave the other fish alone I even got rid of them in the past for that very reason.The top of the ray is still in mint condition,the problem was the bottom were it got burnt,now starting to heal and a few spots on edge fell off and seem to be healing.