The fissidens is growing in my 4-feet planted tank. The temperature of my tank varies between 26.5 and 27.5 ºC. So, you do not really need very low water temperature for it to thrive. My tank is supplemented with CO2, the pH fluctuates between 6.2-6.8, with a KH and GH of 4 and 5 respectively. Lightings wise, I have 4 x 32W fluorescent lights for my 4-feet tank, which works out to be about 2.6 watt per gallon. From my observation, it grows better under direct light then under shade. A key difference between fissidens and mosses is that fissidens does not branch as much. Once established, it will form a nice and neat coat on the driftwood you tie it to, the fronds growing vertically much like erect moss. Another key difference is the growth rate. It grows slower than most mosses, reaching a length of between 2.5 to 3.5 cm in 2-3 months time. The good thing about this is that once it has establish in your tank, you can just sit back and enjoy, not worrying about re-tieing it very often.
