Coloration and leaf size variation? Ludwigia brevipes
I have two tanks.
One is a 6g Fluval edge to which I don't add any ferts, there is a minuscule amount of pressurized CO2 going in and has the stock LED lighting (the one with the attached light bar) and two little Finnex Mighty Ray 21s filling in the sides where the light doesn't reach (Ill try to post a photo tomorrow).
The second is a 35g high tech tank with CO2 via tank & diffuser, EI dosing, and both a Current Satellite Freshwater+ (9 hours at full spectrum setting) and a Finnex Ray2 (4 hour afternoon burst) for lighting.
In both tanks I have similar plants including Ludwigia brevipes. What I have noticed is that in the Edge tank the brevipes grows beautifully with no ferts or CO2. It grows tall, the leaves are small and compact and have a really nice deep green color reaching to a nice orangey-brown on the tops. However, in the 35g the plant grows out more than up, the leaves are very long and spread out along the stem and it's coloration is a very bright green with very little orange.
My question for you all is this due to high light vs. low light conditions for this plant? Will raising the lighting on the 35g (it's currently very close to the top of the tank) help to possibly encourage growth like I see in the Edge tank, as that is really the look id like for the plant? It's interesting to me that the tank I am not fertilizing or adding CO2 to is growing this plant so nicely while it is kind of unruly and not as refined looking in my serious set up. Do some plants look better under more strenuous situations? Again, I'll try to snap some pics tomorrow during lights on time to use as examples. Sorry for the wordy post!