Vallisneria spiralis

Vallisneria spiralis, also known as straight vallisneria, tape grass, or eel grass is a common aquarium plant that prefers good light and a nutrient rich substrate. In the wild, it can be found in tropical and sub-tropical regions worldwide. In most aquariums the leaves grow so long that they float on the surface so the plant needs pruning to stop it taking too much light from plants growing beneath.