Are clownfish sensitive to paraguard? Mine has gone blind.

[Gyr]

I have had a young ocellaris clown in my QT tank for 2 weeks. He had been eating well and acting normally but today I noticed he seems to have lost his vision. He can't locate the food, bumps into things. His eyes look clear, and he has no other visible problems. The QT has 2 other fish in it and they are not having any problems. I treated the tank with a 5 day course of Paraguard and I wonder if that may be the problem (I had read other threads that suggested clownfish may be particularly sensitive to copper treatments and wonder if they are also sensitive to the aldehyde in paraguard).
The current ammonia level is between 0 and 0.25 ppm. pH = 8.3, SG = 1.025, temp = 78. My API Nitrate test is screwy in that the QT water immediately turned orange (20ppm) when I added the first reagent and didn't change after adding the second reagent and waiting 5 minutes--perhaps the paraguard is interfering with the test?
I am mixing up a batch of SW to do a water change, since I can't think of anything else to do.
Any other advice would be appreciated, I hope there is something I can do to restore this little guy to good health.
Thanks,
Kurt

 

[deangelr]

Lower you SG

 

[Gyr]

Lower you SG

How low? Like a hyposalinity treatment, or just run it at a slightly lower SG?

 

[andy2966]

I just treated my tank with paraguard and my clown fish did the same thing. Swimming around like he was drunk. running into the glass etc. I moved him to another tank that I have set up and he seems to be doing fine in there. Good luck