They look fine to me, as for ph don't worry about it at this stage. Thats not ph causing this. Those leaves always go shitty. I never feed mine untill they are in there 3 gallon containers. Normally when they reach 6 inchs. Hope this helps. PS whats your watering schedule
The first leaves always go crappy, you prob split water on em and they burnt under the lights, or you need to feed with a weak nute solution. Your soil is fine. The plants look fine. Happy growing
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