Please help identify this growth on my Foxface

[tystashiro]

I’ve had this little guy in my tank for about two days and noticed this whitgrowth on his tail fin. Is thissomething I need to worry about

 

[fishguy242]

hi hard to tell if just damage ,but may want to treat for infection,close up pic will help, #reefsqaud

 

[vetteguy53081]

Bacteria and fungus are present from likely a viral issue associated with water quality. Water change is first recourse and freshwater dip should help. Melafix will help this heal up. The fish is somewhat thin and eyes semi-sunken.
Feed at minimum:
Mysis shrimp
Small plankton
LRS herbivore diet
Formula 2 flake and frozen

Add selcon vitamins and garlic to foods 2x per week