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While it does seem unusual I wouldn't rule out ich since you haven't seen it. If your fish is healthy enough - it may have some resistance and have a good enough immune system to fight it off. Your best option right now is to keep up with hypo and hope for the best. Ich does reside in the gills - so the flashing favoring the gills seems reasonable. Also - the severity of the infection can vary - fish can be completely covered and others can not show visible signs.
Given the issues with eating, I would advise against copper as it can cause fish to stop eating. Some people swear by garlic in that it helps boost fishes feeding response and helps boost the immune system. So you could try that as well.
Good luck!
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