aqua fern plant..... trichomanes javacicum, will work fully submerged. well....actually, there are about 50% say no... 50% say yes.... but there are images of big ones under water.... made sure of it before I got that one... it was free, and if dont grow and die, dont care... I got all three plants free.. hehe.... but honest... it was hella dry when I took it out.... it started pearling when I put it in my tank! its sooooo happy now!