Crosshatch trigger issue

[Daniel400G]

Hello Everyone,

I really need help with my crosshatch.
I purchased him 2.5 weeks ago .
Eating well and in a qt by himself.
I had him in copper for 2 weeks .
.4ish, not a .50.00
30 percent water change every 3 days
After 2 weeks I removed all the copper (cupermine)
The last few days of copper he slowed down, not swimming as much and yesterday I found him up side down not swimming???
He also has a brown stain on his face that comes and goes. It looks like a stain because there are no bumps .
I got a dose of nitrofurazone that I dosed tonight, is this the right thing to do? Is it an infection?
Please help.

 

[HotRocks]

I would do a 5min FW dip.

https://www.reef2reef.com/threads/freshwater-dip.248898/

Copper can supress things like flukes/Brook/uronema. So when a fish acts strange when copper level is lowered it's usually either the treatment was unsuccessful or there is something else going on that wasn't evident during copper but was supressed and now gaining headway.

I do see possible evidence of flukes in the picture with blues. Something is going on there.