Nute burn?

[Epicxr]

Hello
I was planning on starting my journal but was gifted 2 autos from a friend after 2 days they started getting yellowing tips and its worrying they are just under 3 weeks old and both are having the same issues my ph on run off was at 5 which is what im putting it down to i need a few suggestions on how to help the girls i have waterd with ph water at 6.2 with calmag as they havent had any calmag in over a week.
Is this a bad sign?
Im goin to dirt after this
I use canna product line was using 1/2 strengh will lower that aswell

 

[Epicxr]

I have tested run off she is now at 5.6 and only contained calmag in the watering

 

[AutoWonders]

Pics, no light, would be marvelous.

 

[Epicxr]

Quick update my ec was at .9 for one plant and .8 for the other this was the run off both run off ph was at 5.4 and 5.2 its come up from 4.8 at the lowest this has not halted either plants growth i even raised my led light its now 26 inch above the plants.

Fresh pics

Im just running phd water now at 6.2 both had a litre earlier