First Grow Problems

1
1
Hey guys, I'm pretty much a noob and have some newly transplanted clones showing some issues. I transplanted them 3 days ago into a coco hydro system. Watering once per day with RO water and using GH Cocotek at 75% of the feedchart 330ppm (ebb/flow system - 15 minutes between flood and drain). I am not currently using any CalMag because GH told me from an FB message that none should be necessary. And now going into today I am seeing this. I am also running about 1000 watts of LED 24 inches above @18/6.

PH has been around 5.8
ppm: 300ish
water temp: 78
tent temp: 85
humidity has been as low as 25% but usually around 40%

cocotek grow a&b at 75%
rapidstart @ 1ml per gallon.

Is this mag deficiency, nute burn, over watering? it happened so quick.

Any advice would be greatly appreciated.

Thank you
 
I'm no expert by any means, but my guess would be too much nutes/maybe transplant shock. The yellowing insides of the upper leaves there, the burnt tips, and what looks like maybe a phos deficiency on the lower leaf there in 2nd pic make me think it's just got too much for a young plant and is locking out some things.
But also again, I'm new too.. and not familar with GH nutes or your grow method (i just use soil).
 

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