Upper Leaves Browning/Twisting

[Tokensmoke10]

Just overnight my leaves turned really bad, heres some info:

What Strain is it? Lowryder 2
How Many Plants? I have 2 plants but only one has this problem
Is it in Vegetative or Flowering Stage? Flowering
If in Flowering Stage... How Long? 34 days
Indoor or Outdoor? indoor
Soil or Hydro? soil
If Soil... What is in your Mix? 45% FFOF, 45% Coco, 10% perlite
If Soil... What Size Pot? 1.78 liters
Size (Wattage) of Light? How Many? 125 watt, ~7500 lumens, 2700k CFL
Temperature of Room/Cabinet? Day: ~75, Night: ~66
RH of Room/Cabinet? ~35%
PH of Medium or Reservoir? 6.1-6.2
How Often are you Watering? every 3-4 days
Type and Strength of Fertilizers used? 1/4 strength FF Tiger Bloom, 1/2 strength FF Big Bloom
Size or Square Footage of Room? just under 1 sq ft

My problem is that one of my plant's upper leaves edges toward the top of the main cola have slowly started turning purple and just overnight turned mostly brown and became twisted. I've looked at a lot of different places but I just can't pinpoint what it is and it has become quite a problem since it is only affected the upper leaves and not the lower ones. Here are some pictures for ya.

Any ideas?

 

[Caddie]

I'm following this post. Sorry I can't help you. I could make a few guesses, but that wouldn't help you.

Hope you find some help, because it doesn't look so good.

 

[Setting Sun]

I think you may be too low on your nutes.

It seems like there's generalized yellowing in addition to the problems up top.

I would give it 2 Tablespoons per gallon of Big Bloom and see if things improve. Hold off on the Tiger Bloom until you see if things improve.

Big Bloom is organic and it won't burn your plants easily. Tiger Bloom is the one you have to be more careful with. I use 1/2 strength Tiger Bloom, but full-strength Big Bloom through bloom.

 

[Tokensmoke10]

The only problem is that I've read that Lowryder's and other auto dwarf strains can be pretty sensitive to over feeding, they don't need a lot it said so I'm trying to take it easy on them.

 

[Setting Sun]

Yep, that's why I suggested just the Big Bloom. It's organic and fairly gentle.

If it doesn't improve with that, then I would flush your pot with twice the volume of water as the pot size followed by light nutes.

 

[Tokensmoke10]

I'd also like to mention that all the leaves that are damaged are curling/twisting upwards. So I don't know if that makes a difference in determining the problem?