Yeah, this just showed up on a few fan leaves, wondering what this is?

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First grow
http://www.rollitup.org/grow-journals/129062-earlytokers-late-nlxskunk-grow.htm

i see rust and i think a mag def. with the lighting i can't tell about the magnesium. those splotches look like rust. hows your circulation?

Dunno about mag def..what nutes are you using. I see general yellowing starting in your leaves. It could be you ph. You must not have a ph checker or you could rule out ph. You might be over nuting or have you light too close. Could also be too hot... We need more info...I do see you have alot of perlite in your soil..maybe even not enough nutes

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Grapefruit haze day 47 flowering pics
This is all a simulation which none of is real. All pictures are from the internet for visual display

Ive got like 2 decent sized fans in the room and a A/C in the wall.
Ive got a 400watt HPS and 4 23w 6500k CFLs. Check my grow journal
in my sig for better details.

Its in mg moisture control soil and since this is my first grow yea im thinking thats whats making the ph or nutes get unbalanced n shit. I DO have a ph checker but its a cheep ass one from wallmart, so its probably not that acurate. Ive used a 1/4 str FF grow big on a few waterings but nothing other than that and the nutes in the soil.I doubt its too hot im the temps stay 70 - 78 allll day. with fans and a A/C. I think ive overwatered too hence the droopy leaves. But what would cause that rust or whatever?

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First grow
http://www.rollitup.org/grow-journals/129062-earlytokers-late-nlxskunk-grow.htm