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My Rotala sp. "Nanjenshan" did the same thing. Despite a good fertilizer regimen and a lot of light, I ended up having to throw it out.

The pictures of your plants look distinctly yellow to me...but you said you are dosing iron. Maybe more is needed?

I have heard that Ca and Boron deficiencies will make the leaves curl, as my Nesaea is currently doing. I don't know the contents of the ferts you're using. You said the Ludwigia arcuata is fine, so it probably isn't that, but maybe dosing K (to make the Ca available) will help.
 

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Tom, (not to hijack the thread of course; but out of curiosity)

How much PO4 per day or week are you adding to that 5.5wpg 20 gallon you mentioned?
 

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plantbrain said:
I add it every other day like the KNO3. About .5-.8ppm each time I dose.
Doesn't really matter, the tank is not limited.
Large 50-70% water changes reduce things back down.

As long as I don't limit things, I have no issues. The tank is light limited I would suppose or another way of looking at it: "max light use efficiency"

Regards,
Tom Barr
I was actually looking for a quantity. I have a similar tank and would like to know how much PO4 to does. I am using Mono Potassium Phosphate.
 
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