In aquariums Lemna minor is often regarded as a weed that is hard to avoid. But if you patiently remove visible plants every day you will get rid of it within a few weeks. Goldfish like eating L. minor from the surface.

Author: Tropica

Ceratophyllum demersum has whirled leaves which are densely crowded at the apex of beautifully branched stems, whereas inter-nodes may exceed 3 cm in length at the base of older stems. Ceratophyllum demersum is an obligate, submerged perennial plant which does not form roots. In Nature it is usually found buried in sandy to silty sediments where it anchors itself by modified leaves. Ceratophyllum demersum often forms monospecific populations and is found down to 10m depth as individual very slow-growing plants. In the aquarium, on the other hand, it prefers relatively high light, and it does not tolerate transportation for extended periods. It excretes substances toxic to algae (allelopathic behaviour) and under good growth conditions, it efficiently inhibits most algae growth. It is also a great plant for brackish tanks and will tolerate a certain amount of salinity. Author: Tropica

Salvinia natans is a floating fern that grows quickly if there is sufficient nutrition and light. Light leaves are a sign of a shortage of micro-nutrients. Thin the plant to stop it taking light from the plants at the bottom. Salvina varieties have small hairs on their leaves, making them water resistant. Helps prevent algae by shading parts of the aquarium and using nutrients in the water. Grows very big in the wild and in optimum conditions. A decorative plant for open aquariums.

Author: Tropica