WOW LOOK AT DAT!!! LOOKS LIKE YOUR SEEDLING HAS A ROOT TRACK INFECTION!!!! DAT IS NOT FROM SOIL BEING TOO HOT!!!!! THERE IS ONLY ONE CURE FOR DIS!!!! GET A Susquihanna URINE SAMPLE!!!! DILUTE IT WITH 9 PARTS WATER AND PH MUST BE 7!!!! FEED FROM THE TOP WITH 20% RUNOFF!!!!! REPEAT 3 DAYS LATER DAT WILL BE VERY VERY GOOD!!!!!!!!!😎