You’ve done a good job diagnosing the situation early. Your plants are under significant stress, but they can recover if stabilized soon.
🌡️ Stabilize the Environment
VPD is critical — too low and transpiration slows dramatically, suffocating root uptake.
Raise VPD to a healthy range:
Vegging plants: 0.8–1.2 kPa
Flowering: 1.2–1.5 kPa
💧Watering
Your plants show signs of both overwatering and underwatering stress (drooping, chlorosis, slow recovery).
Allow the top inch of soil to dry before watering again.
When watering, do it slowly and evenly to avoid dry pockets.
Ensure runoff of 10–20% each time to flush excess salts.
Make sure pots drain freely — avoid standing water under the pots.
🌱 Feeding
The yellowing (especially lower leaves) and pale tops suggest nitrogen and magnesium deficiency, possibly combined with pH imbalance.
Check runoff pH (goal: 6.3–6.8) and EC (goal: 1.0–1.4 for mid-flower).
If the pH is off, flush with properly pH’d water until it stabilizes.
Feed a balanced bloom nutrient mix after the flush (something around NPK 2–4–5 or similar).
Add a Cal-Mag supplement once or twice a week for now.
💨 Lighting
Stress plus intense light can worsen the damage:
Raise your light or dim it to 70–80% intensity until plants perk up.
Keep light distance around 18–24 inches (45–60 cm) from canopy for LEDs.
🌿 Recovery Signs to Watch For
Leaves should start standing up again within 2–4 days.
New growth should appear greener and tighter.
Old damaged leaves may not recover — focus on new growth instead.
🚑 Optional Recovery Boosters
A mild kelp or seaweed extract (contains cytokinins) can help roots recover.
Microbial inoculants (mycorrhizae, trichoderma, etc.) can stabilize soil life.
Avoid strong PK boosters or additives until they look healthy again.
Hope that helps and you and your babies get well soon. 😘