To see or clean a fish tank in your dream indicates how you have full control of your emotions.

You keep your feelings in check.

If you are watching the fish in the fish tank, then you may feel that your life is going nowhere or that you are going in circles with your life.

To dream that you are living in a fish tank indicates that you are detached from society. You are withdrawn.

Alternatively, the dream may mean that you are feeling the pressure of those around you.

Consider the phrase of living in a fishbowl. You feel that you are being judged, criticized and scrutinized.