nute burn or deficient?

Hello, Ive been lurking around here for a while. Ive just started my first indoor grow. Ive grown outdoors a few times before. My plants are 16 days old today and a couple of days ago they started to show signs of nute burn. The tips of the lowest leaves started to brown up. Also some of the upper leaves are curling down. Ive done a lot of reading and it seems that those symtoms can be symptoms of other problems like defieciencies. In the last couple of days it seems that some of my plants are not opening up. The leaves are pointed straight up. Also one of them is kind of twisted looking. After reading, this sounds like a copper deficiency. So now im kinda stuck on what I should do. Two days ago when I noticed the nute lock symptoms, it was time to water so I flushed them with pure water. Now, Im not sure if theyre lacking nutrients and I should fert or if theyre just in some kind of nute lock or what is going on.

Ok, here is my setup. Ive got a very small grow, right now 6 plants, grown from seed. Just bag seeds. They are grown in potting soil. I could not find one without food at home depot so I got the one with the lowest levels: 0.07-0.01-0.03. And yes, I stupidly fed them a weak fert solution when they were very young, just a couple of days. 70w HPS running 18/6.

There are pictures in my gallery.

Thanks.

 

By the way, here is the link to where I read most about what my symptoms might indicate. If you go down to the coper section it sites curled leaves, deformed growth, browned tips, and plants not opening up. I have all of those symptoms, the only one I dont have for copper deficiency is the lighter color or yellow leaves, but that could be due to not having enough leaves yet to show it. Actually, now that I think about it, the baby leaves (not jagged) are yellow or light green on all of the plants. But don't these ones normally wilt and die off in a normal plant?

Honestly, I cant see how commercial potting soil could be copper deficient though.

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

 

i dont think theres much wrong with them. try not to give them to much water and give them tap water thats been left to stand in an open container for 24 hours it lets the clorine evaporate.(water must be at room temp) let the soil dry out a bit between watering the roots need oxagen if theres to much water in the soil they cant get it. hope this helps mate

 

oh and maybe your lights to close that browns them up coz of the heat

 

nope, you were wrong. It was a ph problem. I flushed the soil with tap water and transplanted a couple with some baking soda mixed into the soil. They took off after that.

 

so was the commercial potting soil you used the right ph and you fucked it up with the nutes or was it wrong when you got the soil. just wondering because its good to know.