Leaves curled up sideways over night???

[Kevinkellog]

Super crazy salt build up and heat stress flush using a flushing solution from a hydro store they have enzymes to break down the TDS

 

[Beachwalker]

Bought it cheap from Amazon due to finances

I bought that exact meter recently when my old blue cheapie died, it was not accurate and it was a pos! threw it in the trash after a day or two and bought a new blue one for the same price. Hopefully you got a better one?

I agree with all above and like Dirtbag said would flush it asap and I wouldn't feed it for quite a while

Also how close is your light?

 

[El420vz]

Been having no problems (cursed myself already!), smooth grow, ill add a few pics of the 2 girls and the leaves curled up,

See pics 11 & 12 showing a close up of the leaf problem

Im growing in Organic soil and fertz, watering every other day (it needs it, it sups water dry),

So I checked today and the girl on the rights leaves have curled very strangely, both the same gene, both fed and watered the same,

Im in my 3rd week of flowering,

Help!!!

Can anyone help , dont want to fall at the final furlong

That looks like heat stress what's your temp?