Fish still flashing with Coppersafe treatment

[Newms118]

Ive had the following fish in Coppersafe for 3 weeks and 4 days:

Clownfish
Royal Gramma
2 blue yellow-tail damsels

I use the API copper test and its been reading between 2 and 4 ppm the whole time. I haven't seen any signs of Ick (white spots) on the Royal gramma and the damsels. The only issue is that the clown keeps flashing, swimming back and forth across the tank and has been a little bit aggressive.

My ammonia and nitrite are zero in the QT, but my nitrates are above 50 ppm. I did a massive water change on June 18th and re-dosed the tank to bring back the copper to the correct level.

So my question is why is the clown still showing signs of Ick (flashing) even though the tank has been treated for so long and the levels have never been below 2 ppm?

 

[HumbleFish]

When you did the massive WC... Did you add Coppersafe back to the replacement water before it was added to the QT? Or did you re-dose the appropriate amount after it was already in the QT?

 

[Newms118]

When you did the massive WC... Did you add Coppersafe back to the replacement water before it was added to the QT? Or did you re-dose the appropriate amount after it was already in the QT?

It was added after. When i say massive, I mean I put the fish in a bucket with a little of the tank water, then drained the tank completely, added new water, and then dosed up to the right copper amount.

 

[Newms118]

^and then used a net to put the fish in the new water.