Ludwigia inclinata ‘Dark Orange’ (also ‘Atlantis’) is a vibrant stem plant for aquariums, known for its narrow, lance-shaped leaves that turn intense orange to deep red/wine-red under strong light and rich nutrients, creating bold midground/background accents. It grows relatively fast, benefits from regular pruning for bushiness, and requires good fertilization (especially iron) to achieve its stunning coloration, making it a moderately demanding but rewarding choice for aquascaping.