You can try to deworm but not necessarily will work.
The longest fasting was more than a year with ample food (pork, sotong, prawns) given but refused to eat.
Eventually died. I believe there's some underlying conditions which I didn't manage to detect or solve.
But most of my fasting arowanas will start eating within two months without doing anything....
The fasting was due to change of food or bored of eating the same food.
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