First time growing on clay pebbles...leaf curling and dying

Hello guys this is my first soiless grow.
3 weeks into veg from rooted clones
Wilma drip irrigation
I was watering 3 times a day for 15 min, ec 1.0 but suddenly some of the leaves started cannoing down and became dark green
It looked like i was overwatering and i thought i had some nitrogen toxicity.
The last days i reduced the watering to once a day and reduced the ec to 0.5
The things didn't get better and now it seems i have phosphorus deficiency. Leaves are curling and have some rusty dark patches on it
Could somebody confirm it or give any advice?
The temperatures are 21 degrees lights on 16 lights off.
Water temps around 17 degrees
Humidity between 60% and 80%
Ph between 5.5 and 6.5
Flora series nutes
I just filled the tank to an ec of 0.5 of calmag and let it run for 3 hours to clean some salt build up.
Really need to switch them to flower in the next couple of days...they are stretching too much for my room height.
Thanks in advance for any helpIMG_20210322_030216.jpg

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