Over watering?

Current grow is 7 Nirvana AK48 under a 400w MH. Temp median 80°-85°. FFOF & FFLW 2:1 ratio with added phosphorus rich guano. 6/7 look healthy but this 1 has hooking leaves.

'Hooked leaves cause you are running 10 deg. (F) too hot, install a fan to allow the plant to breathe, and keep cool, why adding food to a too young plant...?

If the temps are too hot why is it that only one plant is experiencing heat stress?

dont feed her much. slow down at this stage. she looks good just a little droopy. a fan yes move the air around its huge helps them breath better. The temps are good i run my room at 80-82 every now and then ill spike it to 90 on purpose. I like my plants to drink and they love 80-82. whats your humidity? also

I don't currently have a humidity Meter & I'm not feeding them I pre-mixed the guano

I always believed that when heat stress occurs leaves will taco & the edges would raise?

the 1 leaf is turning up. go to menards for 10 bucks you can get a rh/temp gauge digitial.