I had initially asked what media? But I re-read and see you are just starting to try and root them in a solution. I think it is like you think, it's just trying to root and pulling from leaves possibly. Initially I thought it looked like the start of cal/mag def.
Rick, thanx for getting up close and personal. Your grandson is adorable. The dog is gorgeous too. Do you rent a cherry picker to harvest and trim the plant waay in the back lol. Them two plants are huuuuge!!!