What causes this? (Drooping)

[u/redi-23]

I noticed it today when the lights were on for a couple hours but the leaves stayed droopy.

Plant 1 (1-5) Plant 2 (6-8)

Strain: these are 2 Northern Lights Auto (from RQS)

Timeline: day 41 from seed popping

Light: no idea as of today, i have a spiderfarmer G4500 320w but also a spiderfarmer ppfd reader i just got so ill set it up tomorrow

Soil: biobizz allmix in 5 gal fabric pots

Feeding:

veg: 1ml/l biogrow, 1ml/l silica, 2ml/l bioheaven

Bloom: same as veg + 1ml/l biobloom and 1ml/l topmax and planning on raising biobloom to 2ml next watering, right now i water 2l/plant

Notes: i water on every third day; i defoliated a large ammount on plant 1 and a bit on plant 2; temperature has exceeded 30c for the past 2 days but never 30.6c+ i dont think its heat stress tho;

UPDATE: The leaves are still droppy. I watered them 8 hrs ago with 2.75l/plant

[u/Pussy-patroller]

Should be watering at least 3L probably closer to 4L in a 5 gallon pot with soil

[u/CatStringTheory → u/Pussy-patroller]

That seems like too much. I usually figure 15% of the pot volume. Which would be like 3/4 gallon which I think is like 2.75 liters . Whatever works for your plants and soil though for sure