5ourdiesel
Member
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Hi everyone. I have a few seedlings that sprouted three weeks ago that are under an 8 bulb t5. I have a temp probe at canopy level and the temps are 77-83 ~50% humidity. A few of the seedlings are turning a yellow shade and the lower leaves are getting brown spots on them. I have been feeding them 100ppm cal-mag in distilled with 200ppm nutrients. For some reason none of the cotyledons aren't dying yet so i'm a little hesitant to add more nutrients. the pH is 5.7 and i calibrate my meter each time. the cal mag is over a year old and it sort of looks like Mg++ deficiency. i've had spider mites in the past and this is definately not a bug problem. i dont think that its heat stress either since the spots are only on the lower leaves. the other seedlings that i have that are dark green are drooping slightly while the yellow leaves seem to be fanning up towards the light.