First Grow Cookies Gelato Auto and SweetZz Auto

Week 1 of my first Grow has just passed and I have mixed feelings about my plants but maybe thats because I don’t really know what to expect. While the SweetZz seems to do very well i feel like all Cookies Gelato plants are performing poorly. From the very beginning there were several problems with the Gelato plants. They all have these light green stripes on their leaves and are way smaller than the other plants. Cookies Gelato 2 did loose a seed leaf early on and seems to have a problem building any leafs on that side somehow. I already googled alot but found nothing compareable to this. Cookies Gelato 3 has very stunned grow and has just build its first pair of leafs, but they look weird to me. For the first 3 days after sprouting i used a humidity dome. After that I put on a Ventilator blowing a wall of the tent so every plant is hit by a light breeze. I measured LUX in my tent and it seems sit around 6000 on top of my plants. I watered the SweetZz plants with 200ml of declorinated tap water every 2-3 days and the gelatos with around 50-100ml (because they are way smaller). I used bioDown from Biobizz to bring the ph to around 6,0-6,1. Since I am still very new to growing I would appreciate you guys giving me any tips and advice to hopefully get some yield of of those plants. Thank you.