Need help for my PNT

I've been keeping my PNT for about 5years and recently I've asked my mum to feed my PNT daily while I'm overseas for a week.

However, when I'm back, my mum told me that my PNT doesn't seem to want to eat. So I thought it could me the packet of algae wafer "not fresh" and I went to buy another new packet. however it continues to show no interest in the food.

I took it out and check for any wounds but no visible wounds.

Can someone advise me on this because my PNT havent been eating for quite a few days already