What’s going wrong !!

[Coco bean]

Hi, in need of some help,, 5 week old cutting have now been in R-dwc for 2 weeks, a couple of days ago started looking pale and are now getting worse,,
Done a water change, ph 6, ec 1,, but no improvement,,
Using AN, silicon and piranha, system connected to chiller at 18 degrees,

 

[Nickcg123]

How close is your light?

 

[Coco bean]

How close is your light?

Light are about 30 inches away

 

[Nickcg123]

Can you post pics in better lighting

 

[Powertech]

looks like mag deficiency, but hard to tell with the lighting

 

[Coco bean]

Hope these help

 

[Nickcg123]

Magnesium deficiency

 

[Coco bean]

Magnesium deficiency

Would using cal/mag as a foliage spray be an option ? I did read somewhere of using Epsom salts as a foliage spray ?