Third time but first with a dedicated cabinet grower

I was able to increase the humidity in the range 30-50 manually. D2 of W2 brought third set of true leaves on each RJA and SC. Third batch of each have sprouted and become young seedlings. I have adjusted the pH level of the water I give. I have just started watering every 2-3 days with a water pH of 6,3. I expect them to grow better in the coming days. I am planning on LST next week. I have realized part of the second true leaves of RJA1 is missing. I hope it's not something serious.