How much PAR to keep this plant the same?
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Old 01-09-2015, 03:19 AM   #1
Rainer
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How much PAR to keep this plant the same?


Any idea how much PAR was required for the dark, fine-leafed older growth in this rotala Vietnam? The new growth is in an EI-dosed, CO2-injected tank with roughly 70 mmol @ the substrate, so I'm assuming lighting is the limiting factor.
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Old 01-09-2015, 03:47 AM   #2
Raymond S.
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I have no supporting evidence as proof of it mind you but I have some stems of other types of Rotala and the leaves SEEM to come out thinner when it is deprived of nutrients.
The length seems to indicate that it had good light.
I've been experimenting(out of frustration) with a few stems of what was sold to me as Magenta. The first ones looked like Magenta more so than the second batch does.
The second batch has the diamond shaped leaves of the Macrandra on the very bottom of them but didn't have good anything in the shop where they were. So the upper leaves were just thin and generally bad. But when I put them in my tank things got even stranger. So some of the leaves are thin but longer and some are wide but short...go figure. But a few days back I followed the directions given on a site which I presumes raises them because they sell plants. They said too much Macros can/will hinder up-take of Micros. I reduced the Macros and now 5 days later the top two layers of leaves are more wide but just slightly longer length. Getting better all the time but not long enough growth to say for sure yet. Just 5 days under new ferts.
This leads me to believe that your plants came from somewhere that had good light but poor ferts.
But all guesswork aside, your best bet is to just sit it out till they have new stems come up from the base(don't trim those) and then cut and plant the new ones and remove the older ones. They will change a lot during this time till they get consistent growth.
So these stems will have various length,widths etc. The new ones they send up will be much more uniformed. Mine look just like that/w different size leaves as you go up them. The new ones will be grown in this environment so they will be much better.
They never will look exactly like the bottom unless you put them back where they came from. It's not just the light you have to duplicate all the environment of origin for that.
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Old 01-10-2015, 12:00 AM   #3
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Thanks for the informative reply. If you're correct, that's pretty discouraging since I think the old growth is beautiful but don't have the time to experiment beyond EI, not to mention potential unintended effects on other plants in the tank.

Can anyone recommend something similar in appearance to the old growth that would look good in an EI tank?
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Old 01-10-2015, 12:41 AM   #4
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Quote:
Originally Posted by Rainer View Post
Thanks for the informative reply. If you're correct, that's pretty discouraging since I think the old growth is beautiful but don't have the time to experiment beyond EI, not to mention potential unintended effects on other plants in the tank.

Can anyone recommend something similar in appearance to the old growth that would look good in an EI tank?
foxtail may work for you..

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