Humpback puffer hasn't eaten in a long time!!!!

Hello fellow fish friends, i have a problem with my puffer. At the beggining of July i went on vacation and my GF watched my fish. While she watched them my puffer only ate 1 time throughout a 2 week period and only because she threw in some feeders. Since then i have yet to see him eat anything....even feeders. Its been close to a month now. He swims around the tank sometimes, shows no sign of disease or stress and has basically half a 90g to himself (other half is taken by red severum). So what could it be? The water parameters are fine, and besides adding some fake plants i havnt changed anything.
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DMD123 said:

What is 'fine' water parameters?

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Nitrates are 20-30, 6.7ph, nitrite/Ammonia 0
I even checked for copper cuz i have a kit for it and that's also 0
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I did a water change n nitrates are at 5ish for now. Still not eating

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Sorry havnt looked at this in while. The lil guy died . Really wasnt happy

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