17 day old plant problem. 300w/150w led / 0,15m3

Hi Some of my plants are not healthy. Is there anyone who can help me identify the problem? They are 17days old, in 6 liter pots. Light is 300w LED in "grow mode"(150w) My cabinet is 0,15m3 Temp in cabinet: 26-27 celsius Temp in soil: 22-23 celsius RH: 35-50% i have feed them 1 time. 5ml in totral one liter water to 4 plants. npk 6-1-1 So not strong feed The exhaust fan was turned on yesterday. previously I've only had the door slightly open. with a pc fan inside the cabinet blowing on the plants New growth looks good and healthy, but on the old leaves, it spreads Pics: This one to the left got the same problem

Looks like mag deficiency, Get some calmag+, I foliar spray it, or you can add it to you nute mix. Spray it on about an hr after the lights come on and make sure you have a good fan blowing on the plants.

http://www.growweedeasy.com/marijuana-symptoms

But look at the page above and make your own decision.

No need to overcomplicate things, your LEDs are too lose to your plants and are suffering from light stress. You just need to raise your lights up to about 2.5ft and that should solve the problem.

thanks for the replies guys. Maybe it's both.
I've read that the LED grows often need more cal / mag than cfl or hps grows.

But i think 17 days would be little early?
Anyway, gonna buy some calmag+

The LED is only around 1ft (30cm) away from the plants

I'm going to make the cabinet taller. The height atm is 80cm (2ft 71/2in)
I will cut off the top and make it higher. around 160cm


Again, thank you

I use 300watt LEDs also, I use 1 during Veg and 2 during Flower for 1 plant. I keep them about 1- 1 1/2 ft away. I am just giving advice from my experience.

it is 1 ft away from the pot right now, but it does not work so well apparently
I will build my closet and try out different heights.

Do u ever had mag def? do u use calmag+?

my last grow i used 125w cfl, same soil, nutes, pot size and strain but no deficiencys

thank you for sharing your experience.

I grow Hydro, I did have mag deficiency during my first grow, Haven't had it since I started using calmag. I now add calmag to my res from the start of nutes. I did foliar spray when I first had the deficiency. It absorbs quicker via the leaves while lights are on. It has a low ppm so you don't need to reduce the other nutes.

What LED light are you using? Got a link?

These are the ones I have. I actually have 4 but haven't set up my tent due to space.
http://www.ebay.com/itm/300W-LED-Grow-Light-Full-Spectrum-IR-For-Indoor-Grow-Greenhouse-Hydroponic-Plant-/291003115391?pt=US_Hydroponics&hash=item43c123277f

My buds are dense and fat @ harvest.

Are you able to run the LED with Veg and Flower mode @ the same time? If so try it. Also add a few CFLs to supplement light.

This:
http://www.ebay.com/itm/Reflector-300w-Led-Grow-Light-Kit-Free-Power-cord-Flower-Veg-Switches-Lamp-Panel/370980744468?_trksid=p2047675.c100011.m1850&_trkparms=aid=222007&algo=SIC.MBE&ao=1&asc=20232&meid=4888372588448758354&pid=100011&prg=8938&rk=4&rkt=10&sd=280900784262

Gonna use veg and bloom mode at the same time, and the 125w 2700k cfl-bulb for the lower buds.
Thanks for the info on the calmag+, gonna order a bottle.

So how has the grow been, Id like to see if any changes. Did switching the lights help?