White patches on multiple fish

[chrisb01]

Bought a copperband butterfly with a small what spot on rear fin the store owner told me it was no big deal after getting it home with the other new fish a bought emperor angel fish which looked healthy all the new fish and old fish were semi aggressive and it’s now been about a week the emperor angel fish has big spit along with my dorey and the copperband has the same small white patch along with big spots
The spots on all fish almost look like there color is just gone not sure if this is from attacks a bacterial infection or viral infection please help
Thanks

 

[ISpeakForTheSeas]

To help keep the threads together:
https://www.reef2reef.com/threads/please-help-identify-white-patch-on-multiple-fish.1034811/