Feng shui of building a small fish pond on the second floor.

First, where does a lot of water come from? How to change dirty water?

Second, the roof is not allowed to bear the load, so there should be dozens of tons of water. The higher the building, the worse it is, and the fluctuation of water will cause the building to shake (resonance principle);

Third, this design is bound to leak water.

If you want to keep warm, you can use more effective methods, such as adding insulation to the roof and installing air conditioning at home, which is far cheaper than building a fish pond on the top floor.