Trident fern/ java fern trident is an easy aquatic fern that grows well under low CO2 levels and low/medium light. With sufficient CO2, very healthy and fast growth can be obtained. Can grow on any type of rock or driftwood. can survive on the ground, but the rhizome should not be covered with a substrate. better to grow on higher elevation like wood or rock. a portion contains a plant of around 4 leaves.