I don't know if you even have a problem at the moment. Really, the new growth looks pretty good from where I sit! I really think the damage to the older leaves is residual from the pH adjustment period of your hydroton. Sure you can try backing off the nutes a hair, since newly-rooted clones don't feed as heavily as established plants. Watch for yellowing lower leaves, indicating hunger, and when/if you see that, work back up again.

Okay, 370 is on the hard side- does your city water utility have a website where you can look up the chemical profile of your tap water and check sodium levels? You should be able to get that information. Again, this is just something that is useful to know when you are starting a hydro (or any) grow with water you have not used to grow before.
stinkyattic Reviewed by stinkyattic on . whats happening to my plants plz look hey every one its my first grow, i have 3 pure kush 2 sour diesel 1 master kush. leaves not looking so good watering 4 times a day in veg gh nutes mild growth ph was up this morning to 6.8 brought down 5.7 ppm 645 any help please got them on 4/20 not a great start Rating: 5