First of all, the dragon is a traditional god beast in China and is regarded as a symbol of good luck. Therefore, putting dragon ornaments in fish tanks can bring some good luck. However, we should pay attention to the image and color of the dragon, and choose the image and color of the dragon suitable for the fish tank environment.
Secondly, the orientation of the fish tank also needs to be considered. Generally speaking, the orientation of the fish tank needs to be determined according to the sitting orientation of the house and the type of fish. If the direction is wrong, it may have a bad influence on the growth of fish and the effect of fish tank.
Therefore, from the perspective of geomantic omen, putting dragon decorations in fish tanks may bring some good luck, but the specific situation needs to be decided according to the image, color and orientation of fish tanks.