Suggestions For My GF?

My tank: established 20 years or so, with occasional moves. It's a 29
gal, with 1 GF (about 1.5 years old) 1 tetra, and 1 Raphael cat. (Yes,
I know the tropicals might suffer, but one tank is enough.)

We moved about two weeks ago. My tetra, who is insanely old, made the
trip fine. My GF isn't coping as well.

I'm confident that the transfer was made as well as could be expected. I
put them into a transfer container with old water, and left them there
for 3 days. Aerated the water, didn't feed them, and swapped out small
bits of water with their bucket's water with water from the new set up
constantly over the 3 day period.

The "new" water and the filter had the benefit of all my old "crud" - I
intentionally didn't clean much, so I'm sure new tank syndrome isn't the
issue. I've moved fish across the country and back sucessfully, and this
was only a couple of blocks.

My poor GF - when we first put him in the new tank he seemed fine, but
after a couple of days....he developed some red spots on the back of his
head, and where his front fins attach to his body. I wish I could get a
picture, but the glare from the glass makes it tough.

He used to runsh to the tank in hopes of a treat! Now he spooks and
darts frantically at motion, and spends quite a bit of time hiding under
things at the bottom.

He also has a bit of a tilt when he hovers - swim bladder maybe?

His appetite is fine, and right now he's picking at the rocks looking
perfectly normal. At any moment he might go back to hiding under the
driftwood though.

I fed him peas, and treated the tank with Coppersafe and am on day 4 of
5 of a Maracyn 2 regimine. Sometimes I think he's getting better, but
it doesn't last.

Anything else I should try? This is making me especially buggy, because
I see a flaw in the glass of my tank, so I need to move him to a new
tank before disaster strikes, but I'm afraid he won't survive the stress
of another move right now.

Thanks!