You get total destruction in Year of the Dragon level 1-6 use the yellow bird to knock down the first part of the structure. Now fire the red bird towards the top stone pillar holding up the middle part of the structure, knocking it down to the right. Use the red bird can take out the final tower then fling the fish so it lands towards the front of where the structure used to be.
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I threw the koi where the second pig from the right is.
Launch the fish directly to the flower in the front of the main structure. Ensure it is a tight hit with no bounce and has to be touching the brown base.