Please take a look

[Eiffel]

Here are the pics of a leaf,the plants in generally are healty but i seen some of the fun leaves probbaly show signs of over-feed burn.
Please give me an advice!

What STRAIN are you growing? Chronic
What was the establishing technique? clone
What is the age of your plants? 30days flowering
What Technique are you using? Aero
What substrate/medium are you using?Hydroton
what is the Nutrient temperature? 18 C
What Nutrient's are you using? GH all the 3 parts
What is the TDS/EC/PPM you are using? 1.6-1.8 EC
What is the pH of the "Tank"? 5.5-5.8
Are you sure your calibration is correct on your equiptment? 100%
When was your last watering? run24h
When was your last feeding change? every 10 days
What size bulb are you using? 600W
What is the distance to the canopy? 30cm
What is the canopy temperature? 24C
What is the Day/Night Temp? 18C/24C
What is the current Air Flow? 365 c/m
Is the fan blowing directly at plants? no
Is your water HARD or SOFT? hard
Has plant been recently pruned, cloned off of or pinched? no
Have any pest chemicals been used? If so, What and When? no
Are plant's infected with pest's? no

Thanks
The pictures are in my gallery

 

[hydrorascal]

Looks like a solid PH issue. With GH nutes the Micro needs to go in the res first. Id dump your res.. flush them with straight water for 12 to 24 hours.. refill the res... Micro first.. With the Lucas formula you dont need any Grow either... for veg... 0-5-10 is a very proven formula... 0 grow, 5ml of Micro per res gallon, 10ml of Bloom per res gallon.

 

[MynameStitch]

How big are these plants?

That is a big deal, because that is a big part with how much the plants can take......

You mix the gh 3 part correctly?

If it is nutrient burn like hydro said you will have to flush them out.....

But I Need to know how big the plants are; because deficiencies can be masked by nutrient burn issues and pH realted issues......

Since your in aero; you will have to flush out and spray the roots with clean water and then add the nutrients; the roots have to be rinsed off as well while they are in the system; so let them get rinsed and then add the nutrients once the system is cleaned out.

 

[Eiffel]

How big are these plants? 14-15inch
With the Lucas formula you dont need any Grow either...: i dont use Lucas Formula becouse i dont have RO filter,i use tap water,micro Hard water.(i found the hard water micro is very different from Soft water version,for that reason i dont use Lucas Formula).
You mix the gh 3 part correctly? i mix exactly,but all the 3 bottles-1 2 3.
Never exceed 1.8 EC.
in generally the plants looks healty,this happens only on oldest fun leaves...
Thanks for your interest!

 

[MynameStitch]

That EC is a little high for those plants dude. I would clean out the system and do a flush if I were you and re figure out what ppms they need to be... your plants are only a foot tall and you already have them over 1,000 ppms; that is too high dude..... to be exact depending on what . and meter you are using your ppms can range from 1,000- 1260... you are slamming them with too much nutrients for there size.

 

[seesawsee]

Doesn't look like they are burned. I'd say your water is too hard or something else is causing calcium lockout. I'd flush (for once, it is useful ), then use fresh (store purchased, if need be) water and have at it again a little lighter on nutes, working up to a happy median.

 

[MynameStitch]

If his water is hard ( hard water contains calcium and magneisum) so how is calcium locking out calcium?