Sudden disease(?) to one of four perfect scrog/ coco plants

4 girls in the sixth week of flower.

CFL bulbs
water for 1min 4 times while light is on.
coco medium
bc technaflora nutes
liquid kool bloom bulking formula

all notes are at the lowest recommended doses.

I have one plant that is starting to turn bright green and the tips are starting to burn.

other girls are starting to show signs of the beginning stages of this also

PPM went from 1200 to 2400, so I started a flush today hopefully it will take care of the issue. However, I'm new to this PPM thing so I'm not sure if thats the issue (note burn) I just flushed in case.

Any hints?


I have run this setup several times with no problems whatsoever


two middle picks are of the healthy ones, obviously

2400 ?!?!? Its too high .I feed maximum 1200 and never over that
if u use different nuts its possible to

if ppm raised that much is probably a salts built up. They look healthy but over fed overall so you might benefit from flushing them again using some clearex or similar and restart feeding at a lower dosage..

2400 ppms is on the high side my meter don't even go that high.
Maximum ppms would be like 1600 or so here a link to advance
nutes feed chart da ppm is the same for any nutes brand~

http://www.advancednutrients.com/hydroponics/nutrient_calculator_old/