Why does your puffer fish lay on the bottom of tank and not eat?

A puffer fish may lay on the bottom of the tank and refuse to eat due to stress, illness, or poor water quality. Factors such as high ammonia or nitrite levels, incorrect temperature, or inadequate tank mates can contribute to its condition. Additionally, if the fish is experiencing any physical ailments, such as parasites or internal issues, it may exhibit lethargy. It's crucial to monitor water parameters and consult an aquarium specialist if the behavior persists.