It could be that your mix is too hot for seedlings. Not sure about that.. I was thinking more on the lines of necrossis. With the description you gave it led me to that. It's where you have over or under watered. Use plain ph'd water and they should come around.:thumbsup:
GaGrown Reviewed by GaGrown on . need help with seedling problem I have grown outdoors for 38 seasons this is my first indoor- growing medium is 4 cubic feet pro-mix ph balanced at 6.5- added 15 pounds worm castings- with 1/2 bag of Happy Frog and 20% perlite- this mixture highly recommended by my equipment supplier- growing under a 1k MH at this time, temps are 76-to 80- 24 inches from canopy and 68 to 65 for night temp- plenty of circulation- RH between 57 and 20 - drops pretty low when heater comes on, added a humidifier this morning- Problem is seedling Rating: 5