Is this nut burn or a nute deficiency???????????PICS.. Please Help

DWC
PPM-850
PH-5.8
Temps-75-85(now have adjusted to 77)
Strain- Afghan Kush Ryder
LIGHT-400watt MH
NUTES- Advanced Nutes Grow, Micro, Bloom, Bud Candy, Big Bud, Sensiym, and Rhino Skin.
Water-Tap water(comes out at 200ppm from faucet)

My girl just started to show some yellowing on the top part of the plant about 3 days ago. The bottom half is a dark green. I keep the ph at 5.8 at all times. Is this nute burn or is a deficiency. Any advice or help would be greatly appreciated and I will rep+ for help. Thank u rollitup.

not just bleaching is it?

What like the lights to close to the top of the plant?? I dont believe so. I have my 400watt MH about 10-12 inches from the top.

beastinit702 said:

What like the lights to close to the top of the plant?? I dont believe so. I have my 400watt MH about 10-12 inches from the top.

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doesnt sound to close but sure looks the same as bleach, they been that distance all the time?

Yeah they have stayed at that distance.

well nitrogen and mag start at the lower part so thats them out............

U think it could be temps. We recently installed a new ac unit in the room and temps some times in this room reach 84-85 during the day and maybe some were in the 60s at night.

Somebody????

I dunno, my new growth is usually slightly lighter green than the rest of the plant, else it could be a sulfur deficiency caused by pH lock out, I'm a newb so dont take my word for it.

Check here mate:
http://www.icmag.com/ic/showthread.php?t=11688&page=1&pp=15

Excellent info in there

My plants look like that when I change the timer to 12/12...?

beastinit702 said:

NUTES- Advanced Nutes Grow, Micro, Bloom, Bud Candy, Big Bud, Sensiym, and Rhino Skin.

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That's a lot of shit, I hope your not locking out 'N'

knock it down to ph 5.5-5.6.advance get a jump of 0.4 so your doing like I did,buffering 5.8 but then it jumping to 6.2.
I cant remember the difficiency I read so many lol,but one gets locked out at 5.7 which is another reason to go to 5.5
I had similar,I lifted light and put to 5.5 (I do get a ph rise over night and ends up 6.1-6.2 when I buffered to 5.8,so now I buffer to 5.5).
I think 10-12inch is low,Id go to a metre unless you have fan on them,even so id pul it up a bit 20inch ish.

beastinit702 said:

Yeah they have stayed at that distance.

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Lift your ight and buffer to ph 5.5.
IMO your using to many different nutes,sensi is all you need in veg.

RIXUK said:

knock it down to ph 5.5-5.6.advance get a jump of 0.4 so your doing like I did,buffering 5.8 but then it jumping to 6.2.
I cant remember the difficiency I read so many lol,but one gets locked out at 5.7 which is another reason to go to 5.5
I had similar,I lifted light and put to 5.5 (I do get a ph rise over night and ends up 6.1-6.2 when I buffered to 5.8,so now I buffer to 5.5).
I think 10-12inch is low,Id go to a metre unless you have fan on them,even so id pul it up a bit 20inch ish.

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Do you even know what your talking about? I want to know what gets locked out at 5.7.. not 5.5 not 5.9 but exactly 5.7.. is that what your saying?

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When it burned its the tips of the leave look burned like on my post the one just above yours on the problem page! Yours I don't think their burned but they have to much of something!!!

Thanks everyone!!! I think I will change out my resivor today and just put in Advanced Nutes grow, micro and bloom. We will see what happens. Any body else???

just my 2 cents......get some RO water....give em 1000 ppm. I highly doubt your light is too low, I keep a 1k hps 18" away from tops, never bleached a thing. IMO your not giving to much nutes...your not giving enough.

if your feeding 850 ppm....and 200 of it is from the tap....your only really feeding 650....and who knows what the other 200 is...most of which is probably calcium.
I had the same problems, when I switched to RO it made things much easier.

That is from rapid change in temps when the lights go out. It happend to me before. i changed my thermostat a couple degrees warmer and never seen it again. Keep your inline off at night unless the dehum heats the room to make the outtake turn off. Happends a few times a night. good luck.