Anacharis Densa is a great beginner plant if you have a low light in your tank. Densa is easy to grow, either planted or floating. Anacharis Densa has nice transparent green leaves. It is great at absorbing excess waste for the tank inhabitants. 

Also Known: Elodea Densa

Care Level: Easy

Lighting Requirement: Medium

Co2: Not needed

Growth Rate: Fast

Origin: North and South America

Tank Placement: Midground-Background Or Floating