I want to build a small rockery pool on the stairs and raise some goldfish, but I don't know Feng Shui. Please give me some advice. Can you build it?

It can be built. There are mountains and water in the rockery, a pool under the water and fish in the pool. Very good. The noise problem of indoor rockery waterfall water should be controlled well. There is a certain difference between indoor rockery and outdoor rockery. The biggest difference is the noise of water flow, which is known to all professional rockeries. I have a friend who specializes in rockery and can serve you.