Mag deficiency?

danks.for.asking

Well-Known Member
This is my first grow in coco. I purchased a brick of coco, washed it, and buffered it with cal mag. Seeds sprouted in about 48 hours and now I'm on week 4. I'm feeding them about 500 ppm of GH Flora nutrients and cal mag ph'd to 5.8. What am I missing? Temps are right at 70. Humitity varies from 50 to 60%. They're being fed everyday with runoff. I have one plant that is mixed with soil because I ran out of coco, and its surpassed all of the others, and it was started 2 days later. The 2 in the back are Alaskan purple autos and they seem to be mostly fine. The long and lanky one in the middle is a Peyote Wifi(seems to be a little more sensitive to feeding, even more than the autos), and the two in the front are cheese. The cheese on the right is the one on soil, and its thriving. No issues with that one. Ill provide additional info and photos if needed.
 

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