what is causing this?

Is this a cal-mag issue or possibly light issues.
Fastbuds 420 Northern Lights auto 23 days
DWC under 300watt light at 50% 18" away
General Hydro nutes, Lucas formula
Temps 82
Humidity 40%-50%
40k Lux around top of plant
650 ppm
 

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One thing is your air is way too dry for that temperature.
Get it up to 65-70% and the plant will most likely start feeding correctly and things will straighten themselves out.

Dim your light to around 25k lux too.
Way to bright at 45k.
 
One thing is your air is way too dry for that temperature.
Get it up to 65-70% and the plant will most likely start feeding correctly and things will straighten themselves out.

Dim your light to around 25k lux too.
Way to bright at 45k.
Exactly what I was gonna say..
 
One thing is your air is way too dry for that temperature.
Get it up to 65-70% and the plant will most likely start feeding correctly and things will straighten themselves out.

Dim your light to around 25k lux too.
Way to bright at 45k.
Thank you, I need all the help I can get.
 
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