NEED SOME HELP

From an inexperienced eye i can't diagnose my plant, they all 5 seem perfectly healthy but it looks as if one of my plants has the early signs of a deficiency.. If someone could diagnose the yellow tips on my top cola's leaves and tell me how to fix it i would extremely appreciate it!

Should i be worried? i tend to get overinvolved and worry about my plants like they are my kids.

Not enough N and too much K. Go easy on both.

Time to feed her, SHE'S a fatty hungry gal. What kind of soil you using? size pot? pic of whole plant?

its the plant in the back left. I fed them like 12 days ago. i use sensi grow A&B 4mL in each gallon and use half of each gallon over the period of 3 days between the 5 plants. i mix a in 2 gallons and b in 2 gallons seperately and use them 1/4 gallon of a and 1/4 gallon of b in each plant.

I use pro-mix BX w/ myco and they are 5 gallon pots.

BUMP. overall i think they are healthy just time to feed but the soil isnt dry enough for it. If im not mistaken they r just hungry for nutes

gonna go 1/4 strength A+B+B52 tomorrow (AN Nute Line) and see what happens.

Hi there, ive got the same problem with one of mine! Slightly worse though and their abit bigger, was just wondering what the solution was to yours?? Cheers maxi