RQS Purple Queen (clones)

Happy to receive any & all advice... My first "proper" attempt at cloning. I clipped 4 clones in the hope of getting 3 survivors. The mother is at 6 weeks in to Veg, looking very healthy with a great growth rate. Used Clonex rooting gel, Jiffy pucks, propagator, heat mat @ 25 degrees / 92% RH, with a 60cm full spectrum aquarium LED at a height to give me 250PPFD at the canopy. 🙏 Foliar spray for first 5 days: 4ml Canna Start / 8ml Canna Rhizo = 1lt. Foliar spray from day 5: 2ml Canna A&B / 8ml Canna Rhizo / .5ml Canna CalMag = 1lt. Now on day 6, I've opened the vents. Soon I'll start removing the lid for an hour or so... Is the discolouring of the leaves normal, or a sign of something else? 😯