I'd suggest you flush it. It looks like nute burn.

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I am not above the Influence. I am not under the Influence. I AM the FUCKING Influence!

Thanks guys - will flush and test the water out the bottom and see how things go...

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I don't smoke but I grow?

The level of acidity between 7 and 6 is 100 times. Sometimes those spots on the leaves are an indicator that pH is swinging too far up and down.

After flush either try half feeding every time, or get some pH up and down and control your pH to 6.5, i.e. pH your tap water down to 6.5 on the straight water, and pH up your nute feed to 6.5

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Thanks - I have the pH up and down products from my fish tank - I just haven't been very strict with pH i hope this works.

+rep

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I don't smoke but I grow?

so my new problem is - the plants are too big to take out of my box...

I was thinking to put something UNDER them to catch the water...

HELP?

edit:
I thought about it and i cant flush them because they have time release nutes in the soil.
I ran water through them to test the pH coming out of the water - it is 7.0 on the dot.

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I don't smoke but I grow?

well thats the prob. right there. a-re you mixing any nutes into the soil with your water? its nute burn

You would have thought though that 2 weeks into flower would be long enough for the slow release nutes that came in the soil to be used up already. Or is MG just a crap soil (dont have that brand in my country).

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In the veg stage i had no nute burn using MG soil. and according to the MG site, the time release nutes last 1 month.

3 weeks ago I added fresh soil to the plants when i transplanted them, so in a week the nutes should be pretty much done.

Maybe its a combo of nute burn and bad pH monitoring on my part... I will see how my plants do the next few days and try a flush if i have to... but definitely will only water with 6.5 pH water - no nutes for the next week or so.

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I don't smoke but I grow?

yeah definitely try with out nutes. you could easily be over feeding your ladies.
nute burn nute burn nute burn
post more pictures and updates

Update:

Today I watered with water only and molasses. ph 6.5.
It seems nute burn has been controlled because it isn't affecting any new leaves...

new problem:

relative humidity has been high lately because of the weather - 70% and up. So i have been battling humidity in my box - i have a small dehumidifier in the box, and have been running the heater in the house to suck moisture out. Humidity in the box got to as high as 80% !!!! - right now it is at 68% hopefully the weather turns for the better soon, i would hate to get bud rot.

No new photos tonight - too lazy - i'll try tomorrow

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I don't smoke but I grow?