Water Lettuce is a popular floating plant in aquarium trade - it is extremely efficient at removal of excess nutrients from water and thus very helpful with algae control.
Reproduction in Water Lettuce is by sending runners from the mother plant, each terminating with a baby plant.
Hanging roots of Water Lettuce generate a very natural appearance in your underwater landscape, simultaneously trapping any floating particles and providing a great shelter for smaller fish, fish fry and juveniles. 
Water in tanks Water Lettuce is usually crystal clear!