Deficiency

-Hydro Grows-

What is your experience level? (first timer, novice, experienced...)
first timer
What type of hydro set-up are you running?
6inx6in grodan rockwool cubes on 3ftx6ft trays 400gph activeaqua pump with 1/4 black tubing feed lines(2line each cube)

Your Equipment:

A) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's)
4 600w hortilux hps
B) Distance from tops?.
was at 14in but added gravity today so raised to 16in
C) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)
Hydrofarm-Daystar (added 4in air cooled system with an 4in original can fan)
D) Is there a consistent fresh air supply?
Yes
E) Do you have an exhaust fan and a circulation fan?
8in original can fan for exhaust fan 1 14in oscillating fan 1 18 oscillating fan
F) Size of reservoir?
20 gallons

Your nutrients and water:

G) Source of water. (tap or filtered)
filtered
H) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
GH 3 part (feeding schedule as directed by GH) with advance nutrient additives as directed on bottle (voodoo juice, big bud, scorpion juice, bud candy) liquid karma cal-mag plus
I) What is the ec/ppm of your unadjusted tap (or filtered) water?

J) What is the ec/ppm of your nutrient solution?

K) What is the temperature of your nutrient solution? (high and low temps)
73 to 76
L) Does your ec/ppm show a rise or fall when you do your daily PPM check?

M) Does the ph fluctuate?
no
N) Do you foliar feed? If so, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...)
no
Your growroom:

O) What size of closet, room or hut?
10x10
P) What are the temps and humidity levels while lights are on? ...With lights off?
lights on- 82 to 85
lights off- 76 to 78
Q) Have you seen any bugs in your growroom
no
Your strain:
R) What strain are you growing? (Indica dominate or Sativa dom?)
purple kush
S) From seeds or clones?
clones

i'am at my 6th week of flowering and couple plants leave turn yellow green
i thought it was magnesium deficiency but today i look at the rock wool cube on the ones that turn color there were some salt crystally looking like deposit