I'm in my 5th week Of Veg and 4 of my plants are starting to develope very thin new grow and my fan leaves are curling inward...I was using rock rool then transplanted to soil a week a few days ago before this started to happen....This is my first time growing so maybe it's because I have a rock wool cube inside my soil and it's causing different PH problems but I'm not sure this is my first Time Can some please give me some good advice