Cal mag deficiency or cal mag burn?

SPECS:
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*Sativa auto - blue amnesia XL (9-10 wks)
*Currently 3-4 months of age
*1000w per ten plants leds. (Wattage is correct and tested with multimeter) also can't afford anything but leds in Australia with the price of electricity from China is insane.
*My third grow with the same setup and no issues until now
*Temp 26-27 everything monitored on thermostats. Humidity doesn't get above 45. Monitored on inkbird.
*Nutes are Greenplanet bloom kit. Given once a week and half of what is recommended to avoid burning
CAL MAG GIVEN ONCE EVERY TWO WEEKS.
*Substrate is good quality soil. No hydro.
*Watering enough but never to much. Weigh the pot and finger test .


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QUESTION:



There's 3 current things that have suddenly gone wrong in the last 3 weeks. Previously it's been smooth sailing until now. At first was told it was a potassium deficiency. But after adding a small amount of potash, nothing changed.


1.

The leaves are yellow at the bottom and dropping off. The yellow is growing up the stem quite quickly with leaves going yellow as it does so.


2.

Leaves are "clawing" in the middle of the plant and growing inwards.


3.

Leaves at the top of the plants near the buds are spotted yellow and all leaves have burnt tips on them.



Tried flushing afew weeks ago and nothing changed. I'm wondering if it's to much Cal mag or not enough?


And what do I do from here?

Was told to uproot and give up. But my plants are in late bud/flower so I'm not keen on that. Trichomes are white currently.

Any help would be appreciated. Thanks !

have you ruled out pests? it looks like you still have about 4 weeks left if thats all you are feeding them it could be a deficiency at this stage they get hungry I hope you get it sorted out what size pots are you using? 1 question how does a person check wattage with a multimeter enlighten me?

Looks deficient. Follow the directions on the cal/mag and other fertilizer. Dont halve the dosages unless you have checked the EC/PPM and it's too high. Make sure your PH is good and your water source isnt hard, if u have hard water u dont need the cal/mag but if it's too hard u need to use RO or u will get lockout