Dream about giant koi is an omen for getting things done. There is trouble ahead for you in the near future. Perhaps you are angry with someone or at something. The dream points at your many resources. You need to better focus on your goals.
Giant koi dream is a metaphor for a need to explore an alternative way of life. You expect others to be at your feet. You may be feeling under pressure. The dream states insights from your subconscious mind. You are washing the burdens out of your life.
If you dreamt about giant koi:
There may be some conflict today between what you are willing to do for someone else and what you are willing to do for yourself. Or,the conflict could be at work and concern not only you but some office mates as well. Whenever conflict rears its head there is opportunity for learning. To learn from conflict we need to step back and get some perspective on it. Deep breathing helps very much in this regard. Keep aware of your breath and all will be well.