Here is the troubleshooting form:

What is your experience level? first timer

Your Equipment:
.1) Type and wattage of lights. (HPS 400 watts, fluorescent 500 watts)
.2) Distance from tops? HPS is around 30 cm and fluorescent is 15 cm
.3) Reflector type? (bat wing for the hps and bare bulb for the fluorescent)
.4) Is there a consistent fresh air supply? I'm growing in my attic
.5) Do you have an exhaust fan and a circulation fan? no exhaust fan but there is a circulation fan.
.6) What are the bulb wattages, kelvin ratings, and schedule? 400w for the hps and 105 watts for the fluorescent (500 watts equivalent)

Your medium:
.7) Specific brand and type of soil, (potting soil) and anything you've added to it. (worm castings)
.8) Size of container. medium sized
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? nope

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? tap
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...) haven't done it yet
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
14) How often are you watering between feedings, and how much per watering?
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)
16) Are your ph levels stable, or do they fluctuate?
17) What is your ingoing water's ph? ...your runoff ph?
18) Do you foliar feed? If so, with what, how often, and at what time do you spray?

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? Big attic
21) What are the temps and humidity levels while lights are on? ...With lights off? dunno
22) Have you seen signs of insects in the growroom? nope

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?)2 indica and 1 sativa
24) From seeds or clones? seeds
25) Is this an autoflower strain? no clue
Doctor Herbert Reviewed by Doctor Herbert on . Question on colour of leaves On one of my plants, the tips of the leaves are turning yellow. I'd say about a millimetre's worth or so. Is this due to lack of N? Any help would be greatly appreciated. Thanks! Rating: 5