Nice canopy no doubt about it! Definitely going to get a good yield from this one.
Good eye. You caught that real early. The
Chemdog looks like it's a bit more sensitive to Nitrogen than the other strains. Make sure to monitor the other chems to see if they are starting to fall into that same symptom. Since you switched over to bloom nutrients you should be alright since N levels have been brought down. If you see it progress further then you probably want to reduce your
calmag if it contains N within it. It'll work out. That's my 2 cents on the cupped/clawed leaves.