Other potential problem is that the poor things has internal parasites. It's a common problem with puffers. If this is the case, it won't matter HOW much you feed him, he'll never fatten up.
If you know the fish is eating well, I'd start treating for internal parasites. Can't offer much guidance in specifics, though...Sorry!
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~Sheila
tempus edax rerum
Ideas do not have to be correct in order to be good; its only necessary that, if they do fail, they do so in an interesting way. ~Robert Rosen
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