911 help. Kole Tang has a dark spot while in QT which is getting worse by the day

splix

New member
I added 2 tangs to my QT a couple days ago and they have been on cupramine for the past 48+ hours, i just added the 2nd dose. I started copper due to the clown tang I got also showing signs of ich. I'm measuring Cu levels so they're not lethal.

I've noticed a small black spot on my kole tang yesterday but today it's gotten much bigger, and I've started to notice it on his fin also.
The clown looks fine and is swimming around but the kole isnt swimming like he normally would be.

Is it the copper? What is it and what should I do, I dont have another tank to put him into other than my DT, and my QT is full of cupramine.

HELP :(

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