My pictus catfish won't eat anything I feed him. He hides all day and night. He went come out of his cave. I even put some of his food in his cave but he didn't touch it.
What are you trying to feed him?
If he's not eating and getting skinny, you may have to catch him and try to feed him meaty frozen foods by hand in a little plastic tub.
Then he'll learn it's food and should try to eat it more if it's not getting stolen from him.and he's not sick.
He may not be used to what you're trying to feed him if he's new to the tank.
Pictus are a very social species that need to be kept in groups, kinda like Corys. They get very stressed on their own.