Little help please

[Cannacriz]

Hey I have these 2 autos, had 3 and they're having a rough go with clawing and leaves almost turning eggshell like. Thoughts were heat wind and maybe soil too hot? Thought maybe n toxicity but the leaves are light in color.

Thanks

 

[drdank]

Looks like a magnesium deficiency, you should check your PH.

 

[Cannacriz]

Looks like a magnesium deficiency, you should check your PH.

Its ff of mixed with ff hf soil but I ph my water to around 6 6.5
Ph soil or water? Also can i give calmag or would a flush be better