Thanks for your answer!

I already decrease EC level from 1.8 to 1.6. Now i'm waiting to see if my babyskank will "rise". I use B52 and voodoo juice because i follow the feeding scheduel from Advanced Nutrients website. Although i used half strenth nutrient solution as i saw on the website, I think, curling fan leaves is a sing of overfeeding.

Hope, that is it!!!