Need some urgent help

hey guys, i just got the cam working so heres some pics of the thing, well the black plague i like to call it. Basically the leaves are blackening at the tops and are beginning to shrivel up and turn kinda crispy like, some leaves are also just patchy (w/ black patches) but i have no idea what the problem is. Im using weak ferts, bigfoot veg a and b (there like 2.5, 0.5, 1.5)and(1.5, 0, 2) something like that i can check but i use it roughly every 1-1.5 weeks and its sometimes recommended every 2-3 days depending so i dont think its over fert is what i was trying to say, last year i had this problem i thought it was the soil and location, but its in a new location and i used pro-mix this year instead of horseshit. I think it could be the water, maybe to hard, maybe to soft, maybe toxic, i have no idea, but id like to solve this pesky little problem so any info or advice or expertise is completely welcome. thx
Kevin

Ps. every pic except one is the strain bluegod, the other is WW. But the bg is naturally purple(the stems i mean)

any further questions welcome

....still need some help though

looks like mold in a few of the pics....i think im not to sure

At a guess.....

Arr! You may be experiancing the black pear me ol matey! Visited me the other day twice! Its like death has visited you plants and left its mark. All life is drained out of that part of the plant and it turns black. I just cut mine off and binned it. Made sure the fans were hitting the plant, still got another visit 2 days later, but if u catch it early enough..... Good ventilation is all important.

Could be calcium def.
Adding calcium is good practice anyway.

arrrgghhh, thanks for the help guys, yea i havent had much luck with this problem, no one really knows what it is exactly, i call it the black death, but its messed up, just shows up outta nowhere and starts to turn tops black, im pretty sure ventilations ok cause its all outside, but i was thinking of giving it a boost of calcium like stinkyattic said, hey bro, ill check it out myself in a bit but what can i use to give me babies more calcium? Arrgghhhh i hate this problem, the deficiences pages scrapped from overgrow dont look at this prob either, but anyways anymore input is appreciated, i cant remember who said this but someone said that they had it, topped there babies, and the black death came back, but then it went away again cause u topped again?? does this work, topping the effect parts? anyways thanks guys, i REALLY appreciate the help. Ill be seeing ya'aarrghhhs hopefully sailin' the seven leagues, until then fellow landlovers
Kevin

i dont think its mold either, i checked that one thing, it was a spider webber, thnks for the observation though

Bone Meal mixed with your soil before you plant. Water with Silica Blast later.

i guess ill give'r a shot. thx again