nut burn?? confused

Yeah, I agree it doesn't look like heat stress or root rot. You'd get more drooping.
And with those low levels, burning is unlikely.
You might try a weak solution a complete fertilizer with micronutrients as a foliar feed, it can be absorbed with less dependence upon the condition of the water.
Heave you checked in the runoff tray under that one plant to see if there is any water pooling that doesn't drain? Just a precaution.
Can you see any evidence of mineral deposits on the hydroton pebbles? It would look white, like dried salt.

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Originally Posted by JackdaWack

ok the ph is good a round abouts of 5.5 i need to get a precise ph meter and ppm, the ph test kit i have works onl.y as good as u can read the colors. but here are some pics og the plant top view and side and also a pic of his neighbor.:stoned: ii mean there growing good but why not great ha:dance: um i really thinks its my ppm cuase some plants are great but one and i dont have pests or mold. the red stems i think is a nut. storing indicator, meaning possibly a deffic. of other nuts. or a lock out.... not sure tho, no heat stress and thats ussual.ly at the tops of the plant. any input is greatly appreciated. thanks guys.

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If your using a ph test kit they do suck Ive been there if your ph is around 5.5 the color of the kit shows a color of orange try to raise your ph a little make it more neutral around 6.0 yellowish in color stay around there for a few days. If that doesnt help then maybe you can do something about your ppm but without a ppm meter I would change your res or icrease the flow to that plants emitters. Hope that helps and by the way get yourself a good ph and ppm meter.:rasta: :pimp:

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Originally Posted by stinkyattic

Easy. Don't lay your nuts on a HPS when it's turned on.

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Hehehe.

LOL nut burn, anyone notice that? Nut lol!

haha wow i would have never picked up on that. StOnEr

http://www.drugs-forum.com/growfaq/97.htm

i think this will answer all your questions and put you back on the right track

i always keep a copy of this printed in my grow room

good luck