Hey there grows looking nice the leaves are in general looking healthy good job.
Seeks to be only a few problem leaves so far so don't get to worried yet
1. Check run off water ph level. If that's iff correct it with a few gallons if water
2. Make sure not to over water and don't have the humidity extremely low
3. Make sure your giving correct amounts of nutrients. I'd you have not added cal mag ti the mix yet maybe try some and see if that helps