What’s causing this? These sprouts are about 3 weeks old. Starting to take off now that it’s consistently warm. What is causing the little cut out crispy areas? Pests? Or too much/too little water? Also when do I need to thin them out? They’re maybe 2” tall and just starting to get their “real” leaves. Originally by u/Just-Plum-443 on Reddit: https://tinyurl.com/25qg9gmh