I have been getting a fair amount of new growth coming from the
Fissidens grandifrons. It took the better part of a month to start growing, and even then it is very slow relative to other mosses. Most of the old growth turned a darker color, but the new growth started showing up all throughout the fronds with a bright green color.
Here's the conditions I have been growing it in a 20 gallon tank that is only filled with 10 gallons. I have a spraybar that extends across the back wall pointed slightly towards the surface creating highly oxygenated water. The flow rate of the pump is ~250 gph. I do also use pressurized CO2 on the tank. The moss is tied to malaysian driftwood. This is a bare bottom tank that houses bryophytes for the most part.
Parameters of reconstituted RO water using the Aquavitro lineup for everything listed except the micro nutrients.
- GH: 5-6 dH
- KH: 1-2 dH
- Nitrates dosed to ~10 ppm once per week
- Phosphates dosed to ~1 ppm once per week
- 2 ml of flourish comprehensive added once per week
- The temperature has ranged between 68F to 75F depending on the temperature of the house.
- Lighting is 2 23 watt 6500K verilux sprial CFL's in 10" clamp lights hung at the top of the tank.
- TDS: 141 (after everything has been dosed)
- 5 gallons of water changed once per week
This photo shows the new growth pretty well, just ignore the shrimp that is in the way

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IMG_5027 by
chevyguy8893, on Flickr