Narrow Leaf Java Fern Narrow Leaf Java Fern is a beautiful, hardy aquarium plant with slim green leaves that bring a natural jungle look to freshwater tanks. This plant is excellent for low-tech aquariums because it does not need to be planted in the substrate. Instead, it should be attached to driftwood, rocks, or aquarium decor. Why You’ll Love It: Hardy and beginner-friendly Great for low-tech tanks Beautiful narrow leaf shape Perfect for attaching to wood or rocks Provides cover for shrimp and fry Do not bury the rhizome under the substrate, as this can cause the plant to rot. Attach it to hardscape and allow it to grow naturally. Canada Guppies Tip: Java Fern is perfect for guppy tanks because it is tough, low-maintenance, and provides natural cover.