hey ocho
is there any chance you can take some photos in natural light its pretty hard to tell under red light it makes the leaves a more pale green. you have a bit of leaf curling which with the limp leafs means a heat problem either in the room temps or the temp of the coco, this can slow growth to a stand still it can stop nute intake via the roots and will make a leaf show the signs of nute burn . if in natural light the leaves are pale green i would guess temps/humidity if they are a deeper green with yellowing tips i would say nute burn.