purple kush curling leafs

Hi, new to the forum...maybe someone has already asked this question, but here goes. Growing 3 Purple Kush from CK along with several Indica-dominant strains in a tent. Only the Purple Kush has the "Eagle Claw" and only at the top spire of each plant. Is this nitrogen toxicity? All plants potted...

The purple kush has been there since july 8 with just ph adjusted water. using the ph down bottle. The leafs started curling down once goku put the aurora haze The second week Goku put the aurora haze without any nutrients. just today Goku started with the fox farm nuts. for...