Isoetes is commonly known as the Quillworts. It is one of the carpet aquarium plants with stems of height about 8 - 10 cm. It looks like lilaeopsis but stems are thinner and it grows vertically upward. Quillworts requires moderate to strong light and pH: 6.5 - 7.0. You can prune it regularly and it will forme more and more dense carpet. You can also put it in the middle of you aquarium. Isoetes looks beautifully with glossostigma elantinoides, micranthemum umbrosum and hemianthus thalicroides “Cuba”.