Problem with new tang in quarantine

[Blb472]

Have had this tang in quarantine for a few weeks now yesterday I noticed one little spot on it that looked like a scrape now today it looks like this. Any help would be appreciated so I can get this guy fixed up.

Ammonia 0 ppm
Nitrite 0 ppm
Nitrate 10 ppm
Salinity 1.024
Ph 7.9

 

[vetteguy53081]

Thats s blemish from healing. Assuming it’s eating, it should be fine.
You can add melafix to help the healing But not necessary