cal mag deficiency?

Hi guys, I'm growing three plants in soil using General Hydroponics Flora Series, the AK-47 and super silver are ok, but my white widow is showing some problems, I believe is cal mag deficiency, what do you guys think?

I feel like you need bloom nutrients that's mostly Potassium and pH fluctuations which is likely do the fact that it is gobbling up your buffer i.e. p/k. I am on my computer it is pretty horrible so if your not in flower right now, umm.. oops. Do not use a p/k booster at full strength that can lead directly to flushing and hurt yields. Wait for someone who isn't on a crappy computer to agree

I forgot to mention, the plant it's on the 3º week of flowering. Those pictures might be better.

Wind burn most likely from that fan