Setting up a 4-gallon paludarium is a rewarding way to combine both aquatic and terrestrial plants in a small-scale ecosystem. Based on my experience, starting with hardy plants like Hygrophila Pinnatifida is a great choice because it adapts well to submerged and semi-submerged conditions and grows quickly, helping to establish the background vegetation. Placing a row of Ludwigia in front adds vibrant color and texture, complementing the deeper greens and offering variation in height and leaf shape. To create a natural division within the paludarium’s layout, incorporating multiple colors of Cryptocoryne Wendtii works well. These plants thrive in varied lighting and help fill mid-ground spaces with richer tones, producing a more dynamic look. For a neat and lush foreground, planting a narrow leaf Micro Sword carpet provides a beautiful green base that mimics natural aquatic grass beds. However, micro swords can be sensitive to water quality, so maintaining consistent parameters and light intensity is key to encouraging healthy growth. One tip I found helpful is to gradually adjust water levels as plants grow out of the water, especially for species like Hygrophila and Ludwigia that can thrive emersed. This gradual transition supports robust root systems and vibrant leaf colors. Also, using nutrient-rich substrates and providing a balance of lighting ensures that your plants flourish and your paludarium becomes a stunning, living display. Overall, these plant choices offer flexible growth habits and striking visuals in a compact setup. Whether you're new to aquascaping or looking to enhance a small paludarium, incorporating a mix of Hygrophila Pinnatifida, Ludwigia, Cryptocoryne Wendtii, and Micro Sword will help you create balanced layers and a thriving aquatic environment that you can enjoy for months to come.