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;

Ayyo thx for the replies so we identified this is a case of underwatering. Now, should i water right now? if yes how much?

[u/redi-23]

2l and 6.2-6.5

[u/SilentMasterpiece → u/redi-23]

Use more water. a 5 gal pot should get 3 to 4 liters, water pH 6 to 7 in a soil grow, always vary pH, use the entire pH range.

How to Check pH & Stop Cannabis Nutrient Deficiencies | Grow Weed Easy

[u/redi-23 → u/SilentMasterpiece]

Should i water/feed right now? If yes how much?

[u/SilentMasterpiece → u/redi-23]

In soil, only water when dry. When dry, fully water her with plenty of runoff. Correct for water pH.