Bright green areas on leaves

Any ideas what this could be. Running in coco on a simple GH line w/ calmag. These don't fit the traditional images of deficiencies that I've seen so far. It's on several of my plants, that otherwise look healthy. These were from clones that I cut from the previous run that didn't exhibit this behavior. The only difference between that run and this one is that I've switched from rockwool to coco.

Could be one of a million things. Cant tell without a plant pic. Could be a lower leaf... Mag def? Looks like theres enough N. Dunno, looks like a leaf.

Sorry about that. I have plants in several different stages of veg (some as low as 3 weeks, some as high as 6 weeks.) all showing new signs of this.