When designing your built-in indoor aquatic plant garden, it's important to choose the right plants that can thrive in a kitchen environment. Opt for aquatic plants that can tolerate low light conditions and fluctuating temperatures. Water lilies, lotus flowers, and ferns are excellent choices as they are adaptable and can thrive in indoor settings. These plants not only add beauty but also help improve air quality by absorbing pollutants. Additionally, consider the size and growth rate of the plants to ensure they fit well within the designated space and don't overcrowd the garden.