Yellow/Brown edges on fan leafs burn or def?

[Leonidas]

What STRAIN are you growing? Mendo Purps
What was the establishing technique? (Were the seed or clone?) Clone
What is the age of your plants? 3 weeks
What PHASE are the plants in? Veg 20/4
What Technique are you using? handwater
What substrate/medium are you using?(Hydroton, Coco, with a layer of hydroton on the bottom
What is the Nutrient temperature? 60 deg F
What Nutrient's are you using? Root Organics by Aurora, as well as Amino Aide, and Grow from the soul synthetics line
What is the TDS/EC/PPM you are using? Unsure following the tsp/tbs requirement per gallon on the back of the bottles
What is the pH of the "Tank" Not applicable
Are you sure your calibration is correct on your equiptment?Yes
When was your last watering? This morning
When was your last feeding change? 1 week ago
What size bulb are you using?1000 watt
What is the distance to the canopy?2 feet
What is your RH Factor? 50%
What is the canopy temperature? 77 deg
What is the Day/Night Temp? 77 day - 65 night
What is the current Air Flow? None
Is the fan blowing directly at plants? No,
Has plant been recently pruned, cloned off of or pinched No
Have any pest chemicals been used? If so, What and When? No,

Wondering if this is a Nute defeciency or Burn. I am new to Coco but not growing.

 

[Leonidas]

I just looked through the sticky guide to sick plants. And to me it looks a lot like either a Calcium or Pottasium def. Any thoughts?

 

[JackCough]

potassium would be my guess coco is finicky in that way.
might be old light burn maybe if 1000 was too close.
Lots of help in coco growers forum also.
hope you get it figured out.

 

[Leonidas]

Thanks for the help. Anyone else?

 

[One Love 731]

These thing happen when ph is off. Hit them with 1/3-1/2 strength nutes with a drop of non anti bacterial soap/penetrator as a foliar feeding. make sure you feed nutes every watering and always set them at 5.5 as the ph will drift up allowing your girls to get everything they need. 5.5 is also the best ph when mixing foliar sprays. It looks like they may have already bounced back, although the spotted leafs will not heal. Karma, One Love

 

[SuperConductor]

It's nute burn, cut back on the ppms. You really need a meter so you know how much you're feeding, the instructions on the bottle don't know what your water's like to start with.