After noticing my cotyledon leaves turning yellow quite quick and the tips being yellow I suspected some issues and after checking everything. I Noticed i hadn't properly flushed my Lines causing a PH swing to 6.9 and a PPM of 907 causing these seedlings a ton of stress for around 3 days. Luckily I spotted the yellowing in time and was able to refresh the nutrient solution in time.😰 still feeding 25% strength nutrient solution till 6-8