Tang got white patch during QT

[njoyreef]

Hi reefers,
Need your input and help. I was QT my Scopa tang with Copper power (2.5ppm) + metro. I was 9 days into the QT and today I saw one of my scopas with white patches on body. See the picture. You might have to zoom in and see near tail. Is it Velvet or brook ? What I am not understanding is why this came 9 days into treatment. The water column has copper (2.5ppm) + metro.

I have 2 yellow and one more scopas in the QT. I took the affected tang out into a separate QT and kept him in a 2.5ppm copper power + metro. What do you think is happening ?

Thanks in advance..

 

[vetteguy53081]

Pic a little distant but either bacterial or even a burn. Not sure why 2 heaters but place in pvc so fish has no direct contact with them

 

[njoyreef]

It's one heater..the other is reflection..I like the idea of putting g heater in PVC..