Lime Green Shoots/Help!

What is your experience level? (first timer, novice, experienced...)

Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's) 400W HPS/MH conversion..using MH right now for veg
.2) Distance from tops? about 16"
.3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...) Wing
.4) Is there a consistent fresh air supply? Yes
.5) Do you have an exhaust fan and a circulation fan? yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 400W

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...) Roots Organics Green Light
.8) Size of container. 3gal grow bags
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? jiffy cubes for clones

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? hard tap..350ppm ph is about 8.2
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...) digital meter
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...) PH DOWN! :D
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. FFGB 6-4-4, other fox farm, and Natures Nectar N, P, and K for supplemental if need be
14) How often are you watering between feedings, and how much per watering? watering about every 3 or 4 days and watering until there is a little leeching
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) No additives currently
16) Are your ph levels stable, or do they fluctuate? stable about around 6.4-6.6 added dolomitic lime before planting
17) What is your ingoing water's ph? ...your runoff ph? ingoing usually 6.2 - 6.5, runoff - N/A
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? no

Your growroom:
19) Indoors or outdoors? indoors
20) What size of closet, room or hut? 3x3 grow tent
21) What are the temps and humidity levels while lights are on? ...With lights off? lights on - 75 about 50-60% humidity lights off - 65degrees 60-70% humidity
22) Have you seen signs of insects in the growroom?

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?) Indica...OG 13
24) From seeds or clones? clones
25) Is this an autoflower strain? no

I understand my water is too hard, however I haven't really had any problems in the past and feel like I know what Im doing a little bit, as it's not my first grow, It also seems that the shoot seem lighter after opening my tent from dark cycle but as the "day" goes on, they green up a little bit. Tips aren't burnt so I know Im not over feeding. Overwater maybe? Fe maybe? It's almost like bronzing from the axial portion to the tips from the inside out. Doesn't excess Mg block Fe? or Ca block Fe? One of the plants has curled leaves like a Mg deficiency and purple petioles like a P deficiency with fringing at the leaf margin. Last time I nuted, It was 850 ppms, however, 350 is from alkalinity of the tap water. so only 500ppms were the 6-4-4 FF Grow Big. Lower leaves on all of the plants are healthy. The last picture looks really white some of which is the light reflecting.
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a couple more pictures..it might be a combination of like Fe, Zn, Cu? maybe they just need fertilizer?
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Looks to me like a decent temp change when your lights go out. My plants usually all do that when i switch them from the veg area to the flower room(different temps and longer dark periods). I havent noticed any growth issues so I just let them be haha. As long as you dont let them get too cold, you should be fine. Its amazing how cool an area can get when the lights are off.

thanks for your help! another reply on rollitup said the same thing (the temp difference when lights are out). I feel they look pretty good, but as a novice, trying to stay on top of nuting schedule *before* you start seeing issues is a little difficult yet, and I think it looks like they might just need a good ferting as some symptoms look combined (micros and P mostly.) it's been 5 days since i fertilized last.