Elodea naias

It looks like Elodea Densa but its leaves are more narrow (0.7mm) with a more curly appearance. It also differs through its teeth on the edge of the leaves, which are larger and more spaced.

Elodea Naias is a kind of aquarium plant belonging to the hydrocharitaceae family. It is also known as "Jussie" or "Egeria Densa". This plant has fine and elongated leaves that grow in tight bunches along flexible stems. The leaves are often green, although certain varieties can have a bluish shade. The plant is mainly reproduced by tuft division, although it can also produce clusters of white or pink flowers on the surface of the water.

Elodea Naias is native to North America and is widely used in freshwater aquariums due to its ease of culture and its ability to oxygenate water.