Lower fan leaves dropping. Problem?

[tb0rg]

Hi, I noticed the lowest fan leaves on my plants dropping, some after yellowing some get dark and splotchy. There is some reddish discoloration on some stems. I am uncertain if that’s normal because the lower leaves get very little light or because they are old or if I have a problem.
My girls are 6-7 weeks old, started on Biobizz Light mix, then potted to All mix. I feed with every watering, started with 0.5 ml Grow per liter. I am now at 2 ml Grow per liter and 0.6 ml CalMag because of soft water. My tap starts out at 8.5 after the 2 ml of grow it is down to 6.5 or even lower.

Pictures of a dropped leave and their “living condition”.

Any help is highly appreciated.

[GEORGE]

Every thing looks great to me. Normal when you grown in that type soil from all that I have read. JMO

[Herbitual]

More like a lack of light in this case.

That's a crazy number of plants in that space. One grown properly will yield you more than all of those together.