Adding a SubstrateSource Java Fern (Microsorum pteropus) to your freshwater aquarium helps create a natural look for your tank. As it grows, this plant helps purify your water by absorbing nitrate nutrients. Java Fern can be grown with moderate light fully submersed under water. Though not required, the 3"x4" coco fiber mat can be easily removed with sharp scissors. For optimal growth, tie the plant to wood or rocks. Happy planting! NOTE: Never release plant species into the wild. Before discarding excess growth, allow the plants to fully dry. Photo depicts sample plant, not the actual plant you will receive. Some discoloration may occur during shipping due to the absence of light during transit.