In the past I would have said that copper is the only effective treatment against amyloodinium. I agree completely that Cupramine is the only copper that I would use with a puffer. I am sorry that I didn't respond to this thread sooner. A fine gold or biege powder on the fish sure sounds like amyloodinium to me. The others are right, this infection must be treated immediately. By the time you can easliy see a fine beige powder on the fish it is usually too late.
Copper makes things worse at first because it causes the fish to produce more mucus when they are already having a hard time breathing. This is one reason that I prefer to use chloroquine phosphate (available as Marex by Aquatronics). You may have to get it from a vet. Chloroquine works quickly and even kills parasites attached to the fish. It gives some relief in hours. You can use it by dosing only on the first day at 40mg/gal
in a QTank.
I am not a big fan of FW
dips, but it does help remove some amyloodinium. You can give the fish a FW
dip and then use Cupramine or chloroquine. I believe the two can even be combined. Copper suppresses immune function and a badly infected fish is probably going to have a bacterial infection of the gills to complicate things.
I have discussed a experimental treatment for amyloodinium with Dr. Noga at NCSU, professor of aquatic medicine and Dr. Angelo Colorni a highly respected authority on Cryptocaryon irritans. My hypothesis is that the transfer method should work with amyloodinium. Doctors Noga and Colorni both told me that it should work in theory and it has been proven effective with Crypt (ich). I suggested the idea of using chloroquine on the first day and combining it with the transfer method. You can read about the treatment in part 5 of my series on Cryptocaryon irritans. You can find it in the library at http://www.MarineAquariumAdvice.com
I am sorry if this information is too late to help contactpsb. Maybe it will be useful at a later date. I hope things worked out for contactpsb.