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Yellow Amazon Sword Plants

I have two Amazon sword plants, which are turning yellow. Other plants in 
the tank are doing fine. The fern is dark green, Monywort is also green. I 
don not understand why the Amazon Sword plant is turning yellow. Please 
Following are the specifications for the plant

75 gallon  tank, has bio filter. Undergravel filter. Gravel.
25% water change once a week
I add two tablespoon chelated liquid Iron every week.
About 50 small fish mostly tetras, barbs etc.
I have DIY yeast CO2 reactor.
Two 48" Fluorescent warm white 5000K
The Amazon plants are one year old.