Urgent help needed Coral fragging poisoning fish???

[Jscholtz014]

Hi all, i just finished fragging some mushrooms, however after 5 minutes, i see these white "bleach spots only on my tangs, the clowns and chromis are fine.
please help, 5 minutes ago there werent any of these markings, i have not added a new fish in a long time. they are all swimming as per normal, and are eating like pigs like they normally do.
please see photos attached
kind regards, josh

 

[badboygp]

Do you have activated carbon?

 

[Jscholtz014]

@badboygp I don't. You should see my hippo tang, it looks like when you spill bleach on clothes. And after an hour or two this stuff fades away. I just want to know what it is?

 

[badboygp]

When tangs are stressed they lose some of the color.

But I have never fragged anything in my tank.

 

[Jscholtz014]

When my tangs are normally stressed, their whole body color fades ie. When I rescape or try catch a bristle worm ect. But this looks more like some sort of stain.
I know I shouldnt frag in the tank, but this was just one mushroom on a over hang that looked easy enough to snip.