Auto pre-flowering overall advice needed

[Randy2310]

I'm working with 4 plants at the same time. They're 29 days from sprout. I've done some light LST but not much. I've entered pre-flower with plenty of bud sites forming. I've done spot defoliation here and there to unblock some sites. Are these ladies ready for a full defoliation? I don't want to stress them too much, but I want to open them up to the light, not have moisture issues underneath, and I would like to trim off the tiny sites underneath that won't really produce.

I'm also curious of thoughts on my fan placement.

I noticed very slight nute burn on the tips of a few of the leaves on 1-2 of the plants. Some random bottom leaves showing distress as well.

I just watered yesterday with straight pH 6.5 water. The pots are airy and tend to try out after 3-4 days. I actually split 1 gallon of water between the 4 pots as I get runoff at that amount. Temp average is 80 degrees with roughly 55-60% humidity most of the time.

The only nutes I've added was:
2/8 silica blast (3ml/gal)
2/12 FF kelp me kelp you (2.5ml/gal)
2/16 silica blast (3ml/gal) & FF kelp (4ml/gal)

4x Nirvana autoflower samango XXL in 2 gal fabric pots.
Mars Hydro 2x2x5 tent
HLG 100 V2 4000K Horticulture Lighting Group Quantum Board LED Grow Light
Bottom half of pot FF OF, top outer ring FF OF/HF mix, inner ring FF HF. All mixed with perlite.
2x2
Vivosun 4" inline fan & carbon filter
2 6" genesis clip on fans

[Blowdout2269]

Being an autoflower, I would remove nothing else until it's surely well into flower. Leaf tucking is your friend.
Also, the yellowing across serrated edges is not nute burn.

[Randy2310]

Also, the yellowing across serrated edges is not nute burn.

What would you say if it is then?

[Blowdout2269]

There are many reasons that leaves yellow. Most can be diagnosed by determining where on the plant and where on the leaves. Here are some great tools:

https://www.growweedeasy.com/?s=Edges+yellowing+

I also encourage you to do your own research and lmk what u find. In the upper left-hand corner or this page, use the three lines for the drop-down menu. Click Plant Problems.
🙂👍

[Randy2310]

I would say the light was too low. I raised it a bit.

[Blowdout2269]

Very likely!
Edges like that on lower growth can also be related to potassium. 👍

[3Berries]

I found the FFOF runs out of nutes at about 8 weeks. And you will need calcium.