I want to plant Hemianthus callitrichoides as a foreground plant in my high-tech (55 gal, CO2, ferts, light 2 watt/gal). No one sells them here so am buying from reputable online store. How many of these should I buy? Do they come as individual plantlets or as a bunch? Can they be broken up and planted around the aquarium and allowed to spread and cover? Any help on this is greatly appreciated. Thanks.