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Micranthemum umbrosum is a much fussier plant than many other aquarium
plants. If it does not have a good supply of nutrients, CO2, and light,
the older parts tend to rot, freeing up the younger parts to float up to
the surface. It really prefers to grow emersed. When grown submersed with
other plants, it starts this "rotting" process when the other plants still
look healthy. You can get Micranthemum to look good and spread prettily
across the bottom, but its room, nutrient, CO2, and light requirements are
higher than those of many other plants. It grows emerse in ditches around
here, and I think that it is not as well adapted to submersed growth as,
say, Hemianthus micranthemum.
Paul Krombholz, in cool, dry, central Mississippi.