6th week of Auto grow leaves turning yellow

[shovel1966]

Other than my live introduction, this is my first post. I started my first organic indoor grow using LED lights and autoflower seeds. My current setup is below.

60cm x 120cm x 160cm grow space lined in white reflective plastic.
Kind LED XL450 lights with 20/4 cycle on timer kept about 50cm above canopy
Supplemental CO2 generator (citric acid and backing soda)
Crop King Autoflower Feminized Mixed (unlabeled strains) 6 plants in space
Two 15cm non-oscillating fans blowing over canopy
One 15cm extraction fan to evacuate the air in the space.
rH is kept around 55 to 65%
Temp is maintained between 22 and 28c
11-liter fabric pots
Roots Organic soil by Aurora Innovations
Ph the distilled water to 6.5 and get root temp before watering
Great White Mycorrhizae Added to soil
Worm castings for top dressing

I am now starting the 6th week. Seeds popped around 18 Sep.


All is going great and the tops and leaves are starting to lose their deep green color and getting a bit pale green and almost yellow. Most plants now are in preflower or flowering. I understand that the leaves will start to yellow as the flowers increase in size. Is there anything I should do to try to get the leaves more green? They all seem to be doing well otherwise.

 

[karlkutta]

im far from an expert but the pictures look good to me since often new growth, especially going into flower, will have a bright green color to it. the rest of the plant looks pretty good, i think you are in good shape.
Lets see what other would say though!

 

[Geneiac]

Perhaps time for a top dressing, no? If you're in the minority like me and like to keep it simple, just hit em with some 4-8-4. I like Down To Earth's line of organic amendments. They def seem to be rippin pretty well tho, but if you're tellin me you're noticing that the leaves are getting paler, then I would def suggest a good feeding.

 

[shovel1966]

I thank you both for your replies and support. I am enjoying all the information and great advice this group offers. I will try a slight top dressing this week since I'm hitting the 6.5 week mark.

 

[shovel1966]

I moved the lighting up as I noticed that the lightening (yellowing) of the leaves only affects the leaves on top. Below the canopy the leaves were a deep, darker green.