To bring a touch of life and movement to your built-in indoor aquatic plant garden, consider introducing koi fish. These colorful and graceful fish not only add visual interest but also create a dynamic and lively atmosphere. The vibrant hues of the koi fish, ranging from bright oranges to deep blues, create a stunning contrast against the greenery of the aquatic plants. Watching the koi fish swim gracefully through the water can be a mesmerizing experience, providing a sense of tranquility and relaxation. Additionally, koi fish are known for their symbolism of good luck and prosperity, making them a perfect addition to your kitchen design.