Fish can die if they get stuck in the filter. The strong suction can injure or suffocate them. To prevent this, ensure the filter intake is covered with a fine mesh to prevent fish from getting sucked in. Regular maintenance, such as cleaning and checking the filter, is crucial to ensure it functions properly. If you notice a fish stuck in the filter, immediately switch it off and carefully free the fish. Check for any injuries and provide proper care and treatment if necessary. It is important to monitor your fish regularly to prevent any mishaps and ensure their well-being. Regularly cleaning and maintaining the aquarium and filter will help keep your fish safe and healthy.