Sick plants?

Definitely a calcium deficiency 100%. It could also be caused by your tap water if there’s a calcium-to-magnesium imbalance. As mentioned before, it’s also not good if the leaves are touching the soil. What are your relative humidity (RLF) and temperature in the grow space?

doing less or doing just nothing is sometimes the best way to finish. And if you have some crazy genetics - you should try to start slower and give the plant her time. It takes 60-120 days !(depending on strain) And you cant skip them or do things of day 40 on day 20 or of day 30 on day 30 if the plant is more like day 20.

to much & to early - sorry to be harsch... 1. the extra light should be under your leafes (plant is to small !) - now it causes a lot of lightstress and the plant has no Direction where its SUN is. and the soil under it is too wet , the plant cant transpire .... just a lot of more problems when you dont have a few cm from ground. i strictly avoid it. 2. giving them so much light and nutri in such a small state is like trowing grenates on welps and hope they catch it and defuse it correctly. like the other said ; you need to flush out ; destress , give just water , way less light. like a normal plant without "overdrive-thoughts". Than it can recover ,grow a bit and then you can start with anything else - otherwise she could die - from killing it. best wishes.

Ca def late stage, K def beginig... also probably it's a lock due to over fertelization... there're to little for 1.67 EC flush and feed anew with no more then (water 150ppm if not then add CalMag + veg fert 150-200 ppm) 300-350 ppm in sum 👇😅😂

The extra damage on lowest leaves are probably because they are in contact or too close to the medium. maybe too much P // Maybe a bit too much light not enough info. Is that a 2x2 space? 18 hours and 120+40 = 160 watts is probaby 50% too much even if lower efficacy. Take your light(s) cumulative umol/s production and divied by m^2. reference a DLI table with hours of operation if if it's drasticaly above 35-40 DLI, you need to fix the light situation before assessing leaf symptoms.

looks like to much light, not enough airflow because of how compact the plants are and to much feed with buildup and PH issues.