yes. i find the key to successfully treat copper-sensitive species with cupramine is to ramp up the dosage slowly. the directions on the bottle are too fast. i ramp up 0.1ppm per day and take 4 days to get to 0.4ppm. this allows fish more time to get adjusted to copper.
i've treated all kinds of fish with this regimen, including puffers, and have not had one fish that had reactions to it. every one ate well throughout the treatment too.