Nute burn or a deficiency?!

Hey guys, this is my first grow and I was wondering if anyone can tell me what this looks like. I know there's a ton of info on here about deficiencies/nute burn but after reading up on the forums to my inexperienced eyes, it looks like a couple of different things. I don't want to make a bad decision and further worsen the situation. One member here said he saw nothing wrong with it, but It's bugging me that it's all faded around the edges. It's 3 weeks into veg, BCN Diesel.

http://rollitup.org/t/first-grow.827653/

Setup? Ph? Ppm?

I put a link to the initial thread I had of my grow. I'm in soil, I'll have to check the run off of the soil when I water again, but I only give it tap water here in Souther US that has 160ppm, I ph it to 6.5. I have fed it twice 1/4 nute solution of GH Floraseries in between the 4-5 waterings I've done. I water every 2-4 days. Under a metal hallide at 300w at the moment.

I appreciate any feedbank thanks

Mag def probably caused from over watering

Sna, that's what i've been leaning towards but I've read that Mag definiciences are caused by a heap of other things. So what do I do? Let that bitch dry out?! lol I gave it four days prior to it's last watering and this is where it became more noticeable.

That pot has to be right dry before you water again. (Or very close to) lift it and you can tell how much water is still in there (even 4 days later perhaps).

Id get some epsom salt and mix a teaspoon in a liter of water and foliar feed her for a few days with this weak mixture. Just plain water every 3rd or 4th day to rinse off the salt buildup on the leaves. This is just a quick fix to tide her over till the real problem is fixed. IME, foliar feeding to correct a deficiency is never a miracle cure, but helps to delay the problem that's setting in.

Good luck

I'll try this out. let you know. Thanks

Yeah...what he said ^^^^
when you foliar feed you might want to take them out from under the light when you spray them and let the leaves dry before you put them back under the lights