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I had a very similar situation with a dogface (Arothron as well) puffer. It didn't eat for over a month and ended up getting really skinny. I tried all sorts of things, including live crayfish and nothing worked. Eventually, it did begin to eat frozen mysis. Once it began eating those it started to eat anything and everything I threw in the tank. It took a month but he plumped up and grew much larger over the next couple years. I didn't see mysis listed so give those a try if you haven't yet! The crayfish will also be a worthwhile option.
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