Crystalwort(Riccia fluitans) is a floating plant used as a retreat for young fry and in live-bearing tanks.
It normally grows quickly at the surface. When kept about two to three inches below a light source, it will form dense, bright green mats. Any single branch or antler bud can reproduce into a large colony if the plant is kept in proper conditions. It normally floats, but can also be attached to underwater objects such as logs and rocks.