This is a tall grass plant. If you are looking for a carpeting grass, we'd suggest the mini variant which you can find here - Eleocharis Acicularis 'Mini'
Eleocharis acicularis is very common and thrives in almost all conditions in an aquarium. An open space without shading from other plants is still preferable.
After planting, the roots will start colonizing the surroundings, creating a beautiful carpet of 6-15 cm height. If the carpet grows too tall, you may carefully cut it back to the preferred height.
Eleocharis Acicularis - Tropica Tissue Culture Cup
Type: Stolon
Origin: Cosmopolitan
Country or continent where a plant is the most common. Cultivars arise or are bred in cultivation.
Growth rate: Medium
Growth rate of the plant compared to other aquatic plants.Height: 10 - 15+
Average height (cm) of the plant after two months in the tank.Light demand: Low
The average or medium light demand of an aquarium plant is 0,5 W/L.CO2 : Low
A medium need in CO2 is 6-14 mg/L. A high demand in CO2 is approx. 15-25 mg/L.