You seem to have a PH problem ..you should be between 5.8-6.2 ....Are the leaves shiny? And kinds looks like claws? Check you PH ...if that's not it , it could be a nitrogen deficiency. We had this issue at the beginning of veg our PH was 8.2 we brought it down to 5.8 and it went away pretty much over night......
EITHER way should be an easy fix hope this helps