Tank (water) dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — Dream Explanations - Anonymous
If you dream of a water tank that is clean and fresh, then it represents your inner state of being, your vitality, aliveness, health and well-being.
If the tank is dirty, then this represents ill-health, and that you are due for a cleansing of your negative thoughts and feelings that may be poisoning your mind, body and spirit.
Source: Strangest Dream Explanations • Author: Dream Explanations - Anonymous