twisting leaves is a sign of your ph being off. trust me ive had it happen numerous times before i learned how to properly water using cocopeat. nowadays my phing has become a little bit lax so sometimes i still see the beginnings of twists and thats my sign to get my watering back in gear and start being more accurate in phing my nutrients.
and what i mean by getting lax is instead of using my actual Bluelab ph pen i use the test strips because its quicker and in the long run cheaper than constantly using the ph pen and spending money on the calibration solutions and storage liquid
like