Some Plants Are Running Into Trouble... Need Help!

My guess would be lack of light from shading, or lack of flow to supply nutrients/co2 in that area. It would be nice for one of the gurus to chime in with some more advice.

 

Are we sure that macrandra narrow.
Kinda looks like rotala rotundifolia.

 

Off to the right, in the second picture, there is some, what looks to be, stunted ludwigia ovails. It has some green hairy algae and has lost most of its lower leaves. I'll let you give the diagnosis phishless. Thanks for coming to the rescue one again lol

 

I'll go with ludwigia species and most ludwigia I've had will drop lower leaves if shaded.

Not so sure about coming to the rescue part.

At first glance I'd say a macro deficiency.
Seachem daily lean dosing is very weak IMHO.

I've also never grown Hygrophila Corymbosa.

@Neil what are you dosing and do you have any water parameters?
Lots of light with CO2 and lean dosing is suspect.

 

You could switch to using dry fertilizer such as Macro Micro Nutrient Mix or individual macros and a micro mix which will supply a more complete food that you can control the concentration of the solution. Either of these will provide more macros and more iron for the red leafed plants. The leaf curling looks like a macro deficiency such as potassium or calcium.