How do you paranoia the fish?

It seems there may be a misunderstanding in your question. If you're asking how to "paranoid" fish, it might be a playful way of asking how to create an anxious environment for them, but fish typically don't experience paranoia as humans do. If you're looking to keep fish healthy, it's important to maintain a stable environment, provide proper nutrition, and ensure they are not stressed by tank mates or changes in their habitat. If you meant something else, please clarify!