Final answer:
The nurse should continue to monitor the patient as tidaling is a normal finding and usually does not require intervention.
Step-by-step explanation:
Tidaling of the water level in the tube submerged in the water-seal chamber indicates a fluctuation in the pressure within the chest tube drainage system. Tidaling occurs as a result of changes in the intrathoracic pressure during breathing.
In this scenario, the nurse should continue to monitor the patient. Tidaling is a normal finding and usually does not require intervention.