Helanthium bolivianum 'Quadricostatus'Helanthium Quadricostatus from South America has characteristic light green leaves 10 15 cm long which offer a great contrast to the darker aquarium plants. It is most beautiful when planted in groups, each rosette becoming 15 20 cm wide. Thrives well even at a rather low light. In good conditions, it produces runners which spread over the bottom. Very pale leaves are a sign of a shortage of micro nutrients. There is some confusion about the name of