Can anyone tell me what's wrong?

3 plants, bought as clones, I'm almost 3 weeks into veg. They are growing in coco and im feeding them GH flora series nutes, keeping ph at about 5.7, and they are in 3 gallon pots. A few days after I bought the clones I noticed they had spider mites on them, I've been giving them alternating sprays of azamax and sm90 to take care of the spider mites and it sems be working well. But now that the spider mites appear to be at bay, a bunch of other problems are occuring. Some leaf edges have been turning brown and dying, and it looks like the leaf tips have a little bit of nutrient burn, I've noticed yellowing in the leaf margins which suggests a magnesium deficiency, and on one plant the upper leaves are drooping severely and are folding inward as well. So I upped the calmag a little, and dailed back on the regular nutes, I'm watering every 2-3 days, just when the top of the coco gets nice and dry. And I have also been feeding them Great White once a week for just 2 weeks now.

Anybody at all

That looks like a potassium deficiency but since you are in coco I suspect some type of lockout maybe too much cal/mag.

THanks for the input man

I'd try a flush for 2 days and and then start back at 3/4 full strength what you are feeding. Are you doing the standard GH feed chart?

Yeah and Im feeding 3/4 strength of the chart as is.

For sure, I'd just flush and drop to half. Young plants don't usually need a lot to eat. So if you find their limit and tone it back a hair they should really take off.

Will do man. So you think it is nutrient burn or some toxicity?

Sure do. Hope it helps, keep us posted.