First Grow : BSF Northern XXL Auto

Looks grand. Nice and big/healthy. Just some marco nute, (immobile nute), it's just not enough core NPK+CAL in the Sub and new growth is sucking what it needs from the old fan leafs stores. Could do with an increase in NPK+CAL and with her bring an auto you are using a micro nute right? Increase PK/BLOOM and maybe stick her on 1/3 of grow nutes unless your brand says not to mix grow/bloom together, as I can't mix mine. Good luck.

There is no indication to go off of like what your feeding her. Looks like magnesium deficiency, you also look very rich in nitrogen. Cut back on nitrogen more potassium and phosphorus for bud development. If possible.