Troubleshooting leaf spotting/yellowing

[Ahales1214]

Hi all, first time grower here hoping for a little help troubleshooting some leaf spotting one of my plants is showing.

I am in week 7 of two autoflowers, one of which seems happy and the other of which seems to be struggling (on the right). I have been feeding them a capful each of Tiger Bloom and Big Bloom mixed into a large watering can of water once a week. They’re in felt pots with FF Happy Frog soil. I cycle between straight water and water plus nutes on a 3-4 day schedule. Pretty much I wait for the soil to feel dry when I stick my finger in it up to the 2nd knuckle and then give them a deep watering.

I did not LST (clearly). Didn’t do much other than water and provide nutes. I read that autos need less nutes when in FF soil, but now I feel like I may need more nutes.

Any advice/feedback is appreciated. Thanks!

Edit: Just this morning noticed some yellowing leaves on the left plant as well. Its visible in the 3rd photo if you zoom in on the center base of the plant.

[MidwestGuy]

It’s normal for plants to shed the lower leaves as they mature.

Your plants would be far more productive if given more light. The node spacing indicates inadequate lighting. The plants otherwise look good.

@Ahales1214

Tiger Bloom and Big Bloom

You should also be feeding Grow Big if you are going to use the Fox Farm Trio. It may be responsible for some of the yellowing.

[Rsandds]

You need to test your soil for ec/ppm and ph otherwise you’re flying blindfolded. Those numbers will tell you a lot.