Aquatic Plants oxygenate the water to provide shelter for fish and aquarium life while keeping them healthier and your tank looking better. Java Ferns are one of the world's most widely used Plants in planted aquariums. They can grow in low light conditions and a wide range of water parameters. Planting Java Fern is easy; simply throw it into your water. Really - if you just drop it in, it'll start growing. You can also choose where it will go by burying the roots in some gravel or tying it onto a piece of material.