The use of Brazilian waterweed in aquariums is just one example of how a single planting may come to overtake its aquatic home. Also known as Anacharis and Elodea, they are perennial aquatic plants whcich has been studied for its potential ability to remove pollutants from water sources. They can quickly spread, as floating stem pieces are able to develop roots from leaf nodes, so be careful when they become very invasive. In that case, it is essential that this plant is routinely trimmed or pruned and this is especially true if it is being growing in tandem with aquatic animals like fish, frogs, or turtles.

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Source: Gardening Know How