Rusty margins on old leaves & 'backwards' leaf in the newer leaves

[WalMatt23]

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• Hydro or Soil Using an aeroponics/hydro Aeroflo20 system with 16 plants <o></o>
• Type of light? 1000 Watt HPS. Been on 12/12 since Saturday, March 15th (12 days total) <o></o>
• "Atmosphere" Conditions (Air Temperature during the day is in the 76 – 80 degree Farenheit range; Night temperature drops to 68 – 72 degrees Farenheit. Hymidity has been hovering at or above 40%. I am running an Eliscent 12” exhaust fan with a passive intake that is run constantly. <o></o>
• Waterings Using store bought R/O water. There is a total of 13 gallons (7 in the rez and 3 in each of the 2 chambers). Our machine conostantly runs and recirculates the water. <o></o>
• PH Range 5.7 - 5.9 Been solid at this pH for about 5 days. Previously it fluctuated 5.3 – 6.0 <o></o>
• Nutrients/Supplements General Hydroponics Flora series (micro, gro, and bloom). Using 6 ml of FloraGro and FloraMicro/gallon H2O and 10ml of FloraBloom/gallon H2O. Just using the feeding schedule from GH. <o></o>
• Pictures if possible! Below<o></o>
• Design and Dates Plants are 5 weeks old. Started as 2 week old clones and now are in the second week of flowering. <o></o>

I am growing 13 bubblegum and 3 white widow plants. Lately, on our older leaves, we have noticed a rusty color on the margins as well as tips. In our newer leaves, we have noticed the occasional “backward” leaf. Hopefully the pics below can illustrate what I mean. If anyone knows whats causing this stuff, please shed some light!! <o></o>
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Rusty tips And margins:








'Backwards' Leaves:





for the most part, the canopy looks like this:



So, I'm hoping for the most part that things look good. This is pretty much my first grow, so maybe I'm being too anal. Anyway, if someone can shed some light on what's going on with my ladies, that would be sweet!

Thanks,
Matt