The hemianthus callitrichoides “cuba” also called micranthemum callitrichoides (beware of the confusion with hemianthus micranthemoide below) is one of the smallest aquarium plant. It is a grassy plant that spreads to the bottom of the aquarium to make a nice carpet when maintenance conditions are good.
The hemianthus “cuba”, also called “HC”, is a rather demanding or very demanding plant it requires good lighting (at least 1 watt for 2 liters of water if the tank is shallow, 1 watt per liter at least for a deeper tank), rich soil and CO2 is recommended. I even thought that CO2 was essential, but several members of the forum are making CO2-free hemianthus thrive. The ideal culture temperature is between 18 ° and 26 °.
Hemianthus is sold in pots with roots in rockwool. His plantation is not easy! A maximum of rock wool must be removed before planting. Some aquarists completely remove rockwool and then plant with tweezers to separate each strand. Personally, I did not have this patience, so I planted the little mats as they were, spacing them from each other. They should not hesitate to drive the carpets and stall with a small stone.
When hemianthus has carpeted the bottom of the tank, it should be maintained regularly by cutting: if it is allowed to grow too high it eventually rot at the base and unhook the ground. Since the stems are at most 5 cm, it is necessary to cut. I just use scissors, but then you have to get everything that was cut with a landing net, which is quite tedious …
Hemianthus callitrichoides Plant Pictures