The Eleocharis pusilla is a good plant for the foreground areas of the aquarium. There are different variations of Eleocharis that are sold called dwarf hairgrass, Elocharis is the shortest growing of these. You can plant several pots of the Eleocharis pusilla in your desired areas and watch them expand by spreading runners to create a dense carpet. This plant can also be purchased on cocofiber mats which make it easier to pull the fine roots out which is easier for planting if you need larger amounts in two different sizes. The quickest way to spread your Eleocharis plants is by spreading them into small bunches planted separately.