Help, tops of bud/pistils looking brown and singed

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the tops of one of my buds is slightly hard/dry feeling with a brownish discoloration of the pistils, wondering what could possibly cause it, here's the info on my grow:

What is your experience level? first grow

Your Equipment:
.1) Type and wattage of lights. 400w mh veg, 400w hps flower
.2) Distance from tops? bulb is about 10" away from highest top
.3) Reflector type? 6" cool tube
.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 on 20/4

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. 1.5 cu. ft. roots organic with 4 lbs EWC, 10 cups perlite, 1 cup dolomite lime
.8) Size of container. 3 gallon

Your nutrients and water:
.9) Source of water. (tap or filtered) What's it's ph? tap water i ph myself
10) Method of checking water ph. ph pen
11) Method of adjusting water ph. ph up/down
12) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. fox farm trio using FD's schedule/fox farm sched as a guideline, last feeding was on 6/2 and the dosage was 1.5tsp tiger bloom, 1tsp grow big, 1 tsp big bloom (they have since been given pure water on 6/5)
13) How often are you watering between feedings, and how much per watering? every 3 days, about 3/4 of a gallon until I see decent amount of run-off
14) Any additives or tea's? used 1tsp/gal epsom salt last watering, thats all
15) Are your ph levels stable, or do they fluctuate? stable
16) What is your ingoing water's ph? ...your runoff ph? 6.2 in/6.3 out
17) Do you foliar feed? If so, with what, how often, and at what time do you spray? no

Your growroom:
18) Indoors or outdoors? indoors
19) What size of closet, room or hut? 4'x4'x7' tent
20) What are the temps and humidity levels while lights are on? ...With lights off? on 72F/60RH off 68F/60RH
21) Have you seen signs of insects in the growroom? some earlier in the grow, flying gnat like insects, plants treated with neem oil seemed to stop them

Your strain:
22) What strain are you growing? (Indica dominate or Sativa dom?) Think Different
23) Is this an photoperiod strain? no
24) How old is the plant? 55 days
25) In what life-cycle is it? Vegetative, pre-flowering, flowering, rippening? flowering
26) From seeds or clones? seed

heres some pics:

2013-06-08 12.48.36.jpg2013-06-08 12.49.02.jpg2013-06-08 12.26.18.jpg2013-06-08 12.28.14.jpg2013-06-08 12.49.22.jpg

one with flash one without on the bud, couple of the whole plant, and one of some yellowing leaves that may or may not be related, the yellowing is only a few leaves at the top of the plant

PLEASE HELP AND THANK YOU!!!
 
just the very top of 1 plant out of 4 I have in the tent...

everything else has long white pistils still.
 
Just make sure your not getting mold.Other than that unless you damaged the top stem it's hard to say why just one is doing this.
 
anything that wouldn't hurt to do as a preventative measure or anything that may help?
 
Is that the tallest of the 4 plants? The way the edges of the leaves are curling up a bit suggests it might be a heat issue. You may need to raise your light up a bit.
 
I'll do that for sure, but now it seems like it's spreading to other lower buds on the plant, not as bad but i'm seeing browning pistils on some of the other buds too now... i'll try to get more pics up in a little bit
 
Hey Surf, looking at that plant in the last picture you have a serious magnesium deficiency going on there bro. See that yellowing between the veins and the rust spots on the leaves. With your ph at 6.3 in soil you are too low for calcium & magnesium. You need to get your soil up to ~ 6.5/6.6 and add some calmag to her.

a420er-albums-misc-picture218352-ph-vs-uptake.gif
 
2013-06-09 16.28.58.jpg2013-06-09 16.31.32.jpg

here's a couple more pics, one is the main bud that's affected the most, and the other is another, lower bud that seems to be getting the same problem.... although I am inexperienced and dont know if maybe its just natural aging...

about fixing the ph and adding cal/mag... next watering I plan to water at 6.6, should I wait until I see a run-off of 6.5/6.6 before using any cal/mag?

I've also raised the light up and bumped the temp down a few degrees too because I did seem to have some heat stress like muddy suggested with the edges of leaves curling up..

thanks for the help guys, really hope I can get this under control.
 
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