Nute burn?

looks more hunger, than any calcium or ph issue a bit too early for final fade, bulking just started, i would pump up PK part for few feeds, before slowing or cutting off feed totally

I’d say it’s classic Potassium deficiency.

Nope... you've got a calcium deficiency starting here.... and there are several causes... Low transpiration rates are a common cause since decreased evaporation leads to decreased movement of water — and calcium — through the xylem. Some common causes of low rates of transpiration include inadequate water, high humidity, and cold temperatures - so check your water level, check your humidity and check your temps. I would also encourage you to raise your pH to about 6.2.... in flower, cannabis grown hydroponically needs slightly higher pH than it does when in veg... Good luck!

I think yes✌️ you can noticed the red stems that it's indiced by too much nitrogen, so flush a little bit( 2 times, the same volume water of the pot) than continue to fert with half dose and keep attention to not have the opposite problem