Plants burned,deficiency,need help..

Its my first grow,and ofcourse im messing everything up,my 3 biggest plants I turned to total nothing,they are burned,tired,and really not happy,I took a pictures of the plants,problem no1:
.Dark green -black leaves,too much gert right?
1.This is def of something,what it is? Leaves stay more cupped than speard wide.
2.Lime green,side burns are nute burn? And what is that lime spots,I get them alot,prolly not enough of something in my nute.
3.Plant looks like 60 years old grandpa,whats with it? I did some watering lately and new grow seems to be growing fresh.and 5th pic.
4.Does it have chance to recover?
5.Leaves turning green...why?
Guys,I really spent googling alot,dont think i came down here after first minute to ask,you can see my plants have alot of problems,Ive been googling like crazy,dont have enough strenth to fight without knowing what im fighting with,I need help.400Mh/hps for veg,nutes 17-8-8.

Classic heat stress. How close is the lighting? What is the RH and the temps at the canopy level. Lights 18" away from plant tops with HID lighting. RH should run 40-50% and 70 - 80 F for lights on temps at canopy level.
To much N! Ouch! 17-8-8 is way to much N. In soil, vegging, I run around 5-4-6,,,some times 5-6-9, strain dependent. The P might be a tick high, but some have no problems around 8.......BUT, the N is way high for Cannabis.

I'd say that's classic nute burn, seeing how the serrated tips are burning first even though they're technically lower than the rest of the leaf, which is why they're burning. Gravity, dude. Grabbity.

Check your temps, do a flush, come back if problem persists.

UncleReemis said:

I'd say that's classic nute burn, seeing how the serrated tips are burning first even though they're technically lower than the rest of the leaf, which is why they're burning. Gravity, dude. Grabbity.

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Hey Unc...I agree, the N is contributing, but the classic sign of heat is there to! Canoeing, burnt edge's (nute burn shows at the very tips of the leaves first, necrotic serrations show heat and that can come up quickly. The high N can help bring it on in conjunction with the Heat).
Flushing may not be the best thing here. Flushing can quickly bring on other problems. I might simply use straight water for a few ( 3-5) days. Then restart nutrients at a better NPK ratio,,,,,,lower N!

Dr. Who said:

Hey Unc...I agree, the N is contributing, but the classic sign of heat is there to! Canoeing, burnt edge's (nute burn shows at the very tips of the leaves first, necrotic serrations show heat and that can come up quickly. The high N can help bring it on in conjunction with the Heat).
Flushing may not be the best thing here. Flushing can quickly bring on other problems. I might simply use straight water for a few ( 3-5) days. Then restart nutrients at a better NPK ratio,,,,,,lower N!

Click to expand...

Agreed, after a second look. They look a bit papery too. CLASSIC KNEE SLAPPER

This will help http://www.growweedeasy.com/marijuana-symptoms