What the hell is wrong with this plant? Pictures provided

Hi people As you can see from the picture, one of my tangerine dream plants has something wrong with it, but not quite sure what it is, so any advice/help would be much appreciated..

OUCH!!!
There's a lot more experienced people out there than me...hope you can make use of this.

Good luck.

http://www.420magazine.com/forums/how-grow-marijuana/71664-plant-abuse-chart.html

http://www.marijuanapassion.com/forum/attachment.php?attachmentid=158412&d=1295751999

Mmkay need more info to help you out. What is the ph, how often you feeding it, what is the ppm of the water u feeding it.

you have multiple issues... what are you feeding them? how often? how much? what lights? how close? temps? humidity? ect...

I have 18 plants all planted in Canna professional soil, I feed them every other day with Canna Terra Vega mixed at half strength, They are under 2 600watt HPS lights which are around 15 inches away. The temp at canopy level is 78 lights on, 70 lights off. Humidity is around 50%...

What is the PH?

I find this chart helpful View attachment 2115516

mikmike said:

Mmkay need more info to help you out. What is the ph, how often you feeding it, what is the ppm of the water u feeding it.

Click to expand...

Whats your ph? you can do everything right and if your ph is off you will get nute lockout ect.

I've never checked the PH level. how would i go about that..???

Get a soil ph test and if u cant get that test the water run off

Mr Rules said:

I've never checked the PH level. how would i go about that..???

Click to expand...

mikmike said:

Get a soil ph test and if u cant get that test the water run off

Click to expand...

get a ph meter and maybe some strips.. get back to us when you know the ph. ph means everything 6.5 is ideal

Could be potassium but need the pH as to why.

i got something like that in my dwc setup but nowhere near as bad its in the tip area no discolor just brown/rust spots idk what the ph is cause i dont have a meter but got a test kit that goes by color from the color its in the right area

Magnesium deficiency. They are even 'praying' for Magnesium. Epsoms salts 1/2-1 tsp quart of water as a foliar spray or 1 tbsp per gallon of water as a drench. i wouldnt go reading runoff pH, wont tell you a thing and only have you chasing your tail......if your pH was off that much it would be having more than one issue.....