My lights are 2 inch from my frogbit im giveing you. They thrive so well. There growth also depends on whats under the leafs too. Some people loose the tenticals, I did at first but now there takeing right off.
Hey, The frogbit has been thriving in my tank since I added it and 3 times now have had to chuck loads. My frogbit had hairs on the roots until I added Siamese Algae Eaters and that's one of the first things they cleaned so I'm assuming its algae as there's no hairs on the roots nowadays.
Hi, The hairs are part of the plant, the hairs are what they use to extract vital nutrients from the water. any fish that likes vegatable matter will certainly eat these hairs away as SAE's did on mine. The plants will live after hairs have been eaten but will not thrive to their true potential.
They will take as much light as you can find, any damage is likely to be heat related. Yes definitely root hairs, for the reason mentioned, something that was well known, but only demonstrated scientifically relatively recently actually using Limnobium:
Gilroy, S. & Jones, D. (2000)
"Through form to function: root hair development and nutrient uptake " Trends in Plant Science5:2 pp 56-60
Root hairs project from the surface of the root to aid nutrient and water uptake and to anchor the plant in the soil. Their formation involves the precise control of cell fate and localized cell growth. We are now beginning to unravel the complexities of the molecular interactions that underlie this developmental regulation. In addition, after years of speculation, nutrient transport by root hairs has been demonstrated clearly at the physiological and molecular level, with evidence for root hairs being intense sites of H+-ATPase activity and involved in the uptake of Ca2+, K+, NH4+, NO3âˆ’, Mn2+, Zn2+, Clâˆ’ and H2PO4âˆ’.
We have used Lemna in the past to measure their response to the level of nutrients in the water column (from the "The Charms of Duckweed" http://www.mobot.org/jwcross/duckweed/duckweed.htm, but I've found that both Nile Cabbage (Pistia) and Amazon Frogbit (Limnobium) shows a similar, but much more impressive, response to the level of nutrients in the water column, with low nutrient levels producing relatively smaller leaf rosettes, but fantastic large and "frilly" roots.