Eagle Claw..too much N?

[Los Muertos]

Here's the details:

Soil - 3:1 Miracle Grow Organic/Perlite
Container - 5gal
Strain - DNA Shark's Breath
Nutes - Earth Juice (full line)
H2o - Approx. every 5 days - only when pot is light
Light - 1x150hps+2x26cfl
RH - 40-50%
ph - 6.8
temp - 70-80
3rd week flowering

Any opinions on what's causing this? I'm thinking too much N, but I don't see any burn. It was only about the bottom 1/3 of the plant, but it seems to be slowly working it's way up. Older growth doesn't seem to be affected. Any help would be appreciated. Thanks.

 

[dart420]

from the pics id say heat stress,pic one shows a small space heater behind it????

 

[newatit2010]

Can't help with your problem but looks good to me. Good luck

 

[seasmoke]

flush it with clear, plain water. They should come out of it in a couple days....

 

[ndzbnln]

yeah i cant see it either but your probably refering to the flowering part.due to when you switch it to flowering leaves might yellow.No worries,and the little burnt tips arent tragic looks pretty much healthy

 

[Los Muertos]

from the pics id say heat stress,pic one shows a small space heater behind it????

LOL..yeah, there's a small heater in there. The only place I can keep the tent is in the garage and without the heater,
temps were in the 50s w/lights out. It's controlled by a thermostat so temps stay 70-78, but in that small of a space,
maybe the hot air is blowing on the leaves.(?) I forgot to mention that the tent is only 24x24x50. I know a 150hps
might sound like a little much for a dinky tent like that, but I've got 400cfm out, 160 in and a small oscillating fan so
heat has never really been an issue except in the summer. It pretty much stays ambient temp in there. Thanks for
the advice. I'm gonna try to find another way to get some heat in there.

 

[seasmoke]

hows it going?

 

[toostonedto]

Yeah i get tip hook too, and thought it might be too much Nitrogen as I had to use pH down every day which is Nitric Acid. I tried changing to a pH down that is Phosphorus Acid, but they're still doing it. I also backed my nutes off about 1/2 and they're still doing. pH is adjusted to 5.5 and it's up to 6.4 in 24hrs. Plant temps are fine around 70-75....

Not sure what the definitive answer on this is.

 

[Los Muertos]

Mine turned out to be WAY to much N.