Yellow spots on leaves

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What is your experience level? (first timer, novice, experienced...) first timer

What type of hydro set-up are you running? Bubble bucket dwc

Your Equipment:
A) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's) 400w mh
B) Distance from tops? 12"
C) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...) bat wing
D) What are the bulb wattages, kelvin ratings, and schedule?7500k 24/0
E) Is there a consistent fresh air supply?somewhat, I leave the door open when I'm home, closed when away
F) Do you have an exhaust fan and a circulation fan?no exhaust , a circulation fan
G) Size of reservoir? 5g bucket
H) What medium if applicable.4x4 rock wool cube , hydroton

Your nutrients and water:
I) If using rockwoll for clones or seedlings, did you rinse the cubes well, with properly ph'd water?yes
J) Source of water. (tap or filtered) What's it's ph? Home ro/di 3tds , 7.0ph
K) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. Unknown, fert came with bucket, using this at 1/4th strength
L) What is the ec/ppm of your unadjusted tap (or filtered) water? 003 TSS
M) What is the ec/ppm of your nutrient solution? Unknown ordered handheld Tds meter
N) What is the temperature of your nutrient solution? (reservoir high and low temps) unknown
O) Does your ec/ppm show a rise or fall when you do your daily PPM check? Unknown
P) Does the ph fluctuate? Unknown
Q) 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
R) How often do you replace reservoir water/nutes? What does it look like before changes? (clear, foamy, green, brown...) every 10 days

Your growroom:
S) What size of closet, room or hut? Closet approx 3x5x8
T) What are the temps and humidity levels while lights are on? ...With lights off? Unknown
U) Have you seen signs of insects in the growroom?no, couple dead moths
V) Are the roots long and white, or brown and slimy? Long white

Your strain:
W) What strain are you growing? (Indica dominate or Sativa dom?)Mexican brick bag seed
X) From seeds or clones?no
Y) Is this an autoflower strain?no



I'm getting yellow spots and leaves curling up on one of my plants. Here a pic.


Attachment 288787