FIRST RUN WITH CLONES

Wats up folks, long tome no post. Currently I have a Mac1 and two lemon trees in coco, about 2ft away from a HLG360, running 15/9 in my 5x5.
I potted them 6 days ago and no serious signs of shock but my Mac1 has a bit of discoloring.
Any help is appreciated.

are you feeding them Calmag?
Coco you need Calcium and Magnesium additions as its missing from the medium, depending on your Coco it may have come buffered but you still need to add.

Looks like a calcium/magnesium deficiency to me anyway, what PH is your water your feeding them? needs to be 5.8 to 6.2 for coco below 6.0 for cal and mag to be usable by the plants.

Could be wrong but that's what I would say the issue is.