Dream about empty fish tank is a symbol for loss or lack. You are trying to emulate someone you admire. You are being overly defensive. This dream expresses you not to take the day to day things for granted. You are desperately trying to escape from the demands of your daily life.
Empty fish tank dream is an evidence for some tension or stress in your life. Perhaps you feel that you are not getting through to others or that they are not understanding you. You need to learn to be an independent thinker and not let others influence you too much. The dream is a clue for your curiosity, your subconscious thoughts and your need to express them. Someone who you thought was your friend is trying to take advantage of you.
If you dreamt about empty fish tank:
You may feel a bit of strain today as you try to figure out the best way to get to where you need to be. On the one hand, the happy approach calls for you to let loose, be courageous, and strike out with conviction toward the things that mean the most to you. On the other, a sense of duty holds you back. Take the best of both worlds. Come up with your own plan of attack.