Leaves dying below scrog

Overall I think my grow looks okay but I’ve been having a few issues (deficiencies?) I’m concerned with, pics included. in the very last photo you can see how yellow the leaves are with the plant but the other plants seem okay. I haven’t lollipopped much, most of what you see is from leaves dying below the scrog, I’ve heard that might be normal from lack of light? I can’t figure it out. I’m new so this is an experimental grow, just trying to gain knowledge.

im using a 3000w led with dimmer switch, I have 4 plants in 5 gallon fabric pots, I’m currently feeding with gen. organics GO box (plus some molasses, epsom salt and recharge microbes) co2 bag in tent. I’m growing in soil (ocean forest and black gold) I also watch my ppm/ph, temps and humidity.

Any advice for this newbie would be great, thanks lol

Every thing below the scrog needs to be picked clean. Try to shoot for 18 inch of canopy. Do you have a fan under the scrog blowing air? Looks like you need a little n boost. What week are you in in flower? You can defoliate a little day 21 and 42 of flower.

There should be nothing below the net.

I concur with @MickFoster there should nothing left under the screen.

I slowly take my under growth away bit by bit and got to this stage and can’t be arsed contorting myself under here to get the stragglers lol.