Green plants turn red using CO2 and Thrive??

I have green and red plants in a high tech tank. I use seachem root tabs and Thrive all-in-one from Niloc-G. The plants are "happy" and are growing. My concern is that the red pants to have new growth coming in green (picture #1), or ALL of the growth of the rotala rotundifolia picture #2 I put in a week ago and has doubled in size is green.

Do I need to do anything other than what I'm doing below to get them red? Add iron to supplement the Thrive? More light?

Some particulars of the tank:
46g bowfront
CO2 pushed so the dropper is middle green (no yellow)
Fluval 3.0 light on at 75% brightness for 6 hours a day (mostly to control the hair algae that has been a problem for me)
Thrive 5 sprays 2x a week.
Weekly water changes of 33% or so.
water parameters ok
pH around 7.6-7.8

FYI, the Thrive chemical composition is:
Total Nitrogen(N) 3.09%
Available Phosphate(P2O5) 1.58%
Soluble Potash(K2O) 10.4%
Magnesium(Mg) 0.32%
Calcium(Ca) 0.03%
Sulphur (S) 0.76%
Boron(B) 0.008%
Copper(Cu) 0.0002%
Iron(Fe) 0.65%
Manganese(Mn) 0.168%
Molybdenum(Mo) 0.0006%
Zinc(Zn) 0.0038%

 

Turning plants red is primarily a result of lighting, the more light the more red.

Additionally, nitrate limitation will help some plants become more red (like your rotala rotundifolia and all its variants). This requires control over each nutrient tho which you do not have with thrive. It will also not benefit the ludwigia in pic 1.

Iron will not, iron is necessary for growth, but will not promote reds.

 

Turning plants red is primarily a result of lighting, the more light the more red.

Additionally, nitrate limitation will help some plants become more red (like your rotala rotundifolia and all its variants). This requires control over each nutrient tho which you do not have with thrive. It will also not benefit the ludwigia in pic 1.

Iron will not, iron is necessary for growth, but will not promote reds.

Am I better off turning the light from 75% to a higher percentage, or having the light on longer?

 

Higher intensity, but you will have to watch out for algae, increase CO2 a bit with it

 

Higher intensity, but you will have to watch out for algae, increase CO2 a bit with it

I have pink, cold white, pure white and warm white at 85%, and blue light at 30% using the pro settings. Sound right?

 

A Guide To Getting Plants To Turn Red Or More Colorful | Aquarium Plants Forum | 394325

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