Is this burn from the light being to low? I have raised the light over these plants. I believe it is about 18". I also lowered the temp from 85 to 83 with a deadband of 2. I felt 85 with a deadband of 3 was allowing to high of a temp on the high side of the band.

The yellow leaf on the plant that is in the background is a result of a mis feed earilar in life. We're learning......

Thanks for your help.