1st Plant Struggling...no idea why

Hey This is my first post so i will try not to noob it up.

I have a 430W HPS lamp in a 6 foot tall by 5 feet closet

I have two 120mm fans circulating air out the top of the closet, and one passive air intake at the bottom to let in cold air.

I have an osscilating fan to help with the stems and to cool the plan a little

my temp is about 85 degrees which is a little hot and my humidity is low around 20-30% . I use a glass dish with water in it to help increase humidity

I have the one plant only as my 20+ other clones ALL DIED...i guess thats the price i pay for learning...

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Here is my problem. New leaves grow in fine but the older ones start to get brown tips then eventually they just turn yellow and wilt:



And here is a picture from the top of the plant:

[URL=http://img150.imageshack.us/my.php?image=200803291604ly6.jpg][/URL]


I thought this was a Nutrient burn so i slacked off on the nutrients and flushed the plant and have been watering without nutes for 4 days now and no improvement so far....

Any Tips Would Be Greatly Appreciated!

Thanks,
J$F

Are U Phing Ur Water?

Nutrient burn.

Why are you feeding such small babies? If you've used a proper soil mix, they don't need fertilizers at this point. You didn't mention what your soil mix is ... so, what is it? ~lol~

Vi

what size of a pot is that, looks like a dixie cup?. you might want to transfer soon to a bigger pot and your plant will show huge improvement.

Yeah I'm moving it into a bigger pot today...and its my first time and a friend advised me to give nutrients after 3 weeks...

what kind of nutes are you using? for your first feeding you might want to give half the recommended dose.

right now its not even getting any nutes...and i JUST got a bigger pot...any tips on moving the plant over? Should i just tip it out?

Hold The Stem Between Your Index And Middle Finger To Secure It And Flip It Over Slowly. Its Quite Easy

Yeah thats what i figured...i think it will be much happier now

How often am i going to be watering now in a large pot like this?

The leaf edges are beginning to turn upwards...is this because the light is too close?