? about hystrix tail

so i have 1m/1f hystrix in my custom 160 along with 5 heckelii, 3 altifrons and 4 clown loaches. It looks like one of the other fish have done some work on the rays tails. The fin (paddle) part is gone on both of them. the tips are white. I have since pulled everyone else out and left the rays alone. What meds should i go with? or what would you guys do? thanks.

sorry about posting it here. In my rush i must have not realized i was in the media area. I added salt, and just bought some mealfix. Gonna do a search to check if its ok with rays. Also if a mod can move this to the right area, id appreciate it.