That plant is actually Bolbitus Heudelotii. They prefer softer water with a lower kh and gh. If you find that leaves begin to turn black after some time has pasted or new leaves come in nice and green but then turn black later on the plant is reacting to the kh and gh of the water being too high. They are slow to establish but once they do and especially if in a tank with pressurized CO2 they can grow very quickly and quite huge. The literally 1" tall, 2 leaf plant I started out with grew to a size that it covered over 1/4 of my 220g tank. I have split that monster up so many times and have a hard time keeping it down to about 18" wide and 15" tall. You also have to watch keeping them in too much light too many hours as they are prone to BBA. Also to keep it in place and allow it to anchor to the DW you need to use fishing line or black 100% cotton thread to tie it on.