Is this potassium, phosporus deficiency?

Growing kali mist x black domina
Wilma drip system feeding 15 min every hour
Temperature and humidity are always on spot
Growing under 600 watts lec and high intensity led.
Ph 6.0 and ec 1.8
5th week flowering

Hello guys
My plants started showing some yellowing and burned leaves tips.
some leaves are twisting and they feel very dry and crispy.
i can also see some bronze red marks on some leaves.
i was feeding them 1.6 ec but yesterday i add some bloom fertilizer till 1.8 ec
I also lowered the led's, they are at 30 cm from the canopy.
I had problems with aphids but it seems under control now
can somebody help me diagnosing this?
thanks in advance

What temp is the water? I'm just throwing out ideas and am not an expert, but to me it looks like some kind of root related stress. It's possible the damage you are seeing was caused by the aphids and is still recovering or maybe you still have some munching on the roots?

Masterdank420 said:

What temp is the water? I'm just throwing out ideas and am not an expert, but to me it looks like some kind of root related stress. It's possible the damage you are seeing was caused by the aphids and is still recovering or maybe you still have some munching on the roots?

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Thanks 4 your reply...the water in the reservoir is at 21 degrees.... I just released loads of beneficial predators in the room...under the microscope i couldn't see any more aphids alive on the leaves but yep i dont know if they could be munching the roots....

Gonzalaselva said:

Thanks 4 your reply...the water in the reservoir is at 21 degrees.... I just released loads of beneficial predators in the room...under the microscope i couldn't see any more aphids alive on the leaves but yep i dont know if they could be munching the roots....

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The ones on roots are harder to see. You'll probably need a magnifying glass or a phone with a good zoom function. Give the roots a look over and see what you can see. Could be old damage too and plant may just be in recovery. Those little buggers can cause a lot of damage in a short time.