My wife thought this was my photo when it came up for her to vote on, since we had shot some near-identical pics a few weeks ago. Definitely chaotic! I think some levels, contrast and saturation adjustments would have helped the visual impact of this image. It looks somewhat flat to me.
All i can see is your shadow. Think it spoils this image. However good idea for the challenge. I was once told to look at the light...light adds a dimension of colour that your shadow is hiding.
Great photo! This is a definite chaotic situation. These fish are piling on top of each other frantically for something to eat. I really like this picture. Good job!