Another Yellow Leaf Problem!

:stoned:[First Time Grower:stoned:]

I know its another yellow leaf problem but I have yet found a definitive answer for my plants...

As you can see from the attached pictures I have two plants with the same problem, some leaves are turning completely yellow, others are on their way, while a few remain completely green. The yellow leaves are not dry!

Our indoor grow area is a 1.6ft X 1.8ft X 2.6ft converted old dresser with white painted inside walls. A 150 watt light hangs above with about 4 to 6 inch separation from the plants. This all sits in our garage in So. Cali with daily outside temperatures of roughly 65 - 75 degrees. The plants are on a 12/12 cycle.

We feed the plants nothing but water. BUT, my brother was giving them tap water rather than reverse osmosis, drinking or mineral water. We recently (two days ago) started giving the plants supplements of CO2 through fermentation, and brand named "plant food". Those supplements gave the plants a beautiful aroma the first day after but not as strong of a smell the second day.

So, could any of those factors be a big enough reason as to why the leaves are this color? Should I be worried?
Our last plants were outdoor, but fed with tap water and yet we didn't have any problem leaves. Would it be something completely different?

needs fertilizer. need a fan in the growbox too, if you don't already. a little Schultz fert would work. obviously this is not an expensive grow, so don't buy an expensive fert. 7 drops in a gallon of water will turn your plant around.

I knew I left something out.

Yes we do have a small fan...
http://ecx.images-amazon.com/images/...500_AA300_.jpg

... And its going non-stop throughout the grow area.

Thanks for the tip on the fertilizer. I'll give it a shot!

Not sure anything is wrong.....

How long been in 12/12? Looking close to done to me, and on 150 cfl. Size???

fill out troubleshooting form.

What is your experience level?
First timer

Your Equipment:
1) Type and wattage of lights.
150 watt high pressure sodium

2) Distance from tops?
4'' - 6''

3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)
The light is in a fixture with possibly mylar around it. The dresser is painted white inside for greater light reflection.

4) Is there a consistent fresh air supply?
Vent holes.

5) Do you have an exhaust fan and a circulation fan?
A simple desk fan.

6) What are the bulb wattages, kelvin ratings, and schedule?
150 watt, 12/12 cycle for about two weeks.

Your medium:
7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)
Dirt mixed with potting soil. Also added miracle grow plant food (after noticed yellow leaves)

8) Size of container.
One 2 gallon and one 1 gallon container. No transplanting to or from.

9) Did you use peat pucks (or similar) to root clones or germinate seedlings?
Clinic bought clones in cubes

Your nutrients and water:
10) Source of water?
Tap, no pH check/balance.

11) Method of checking water ph.
None.

12) Method of adjusting water ph.
None.

13) Specific brand and N-P-K ratio for each bottle.
None.

14) How often are you watering between feedings, and how much per watering?
Watering every two days with roughly 12 - 16 fl. ounces.

15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)
None.

16) Are your ph levels stable, or do they fluctuate?
Unknown.

17) What is your ingoing water's ph? ...your runoff ph?
Unknown.

18) Do you foliar feed? If so, with what, how often, and at what time do you spray?
Nope.

Your growroom:
19) Indoors or outdoors?
Indoors, in a garage.

20) What size of closet, room or hut?
1.6ft X 1.8ft X 2.6ft

21) What are the temps and humidity levels while lights are on? ...With lights off?
Unknown.

22) Have you seen signs of insects in the growroom?
None.

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?)
Corleon and Master Bubba

24) From seeds or clones?
Clinic bought clones.

25) Is this an autoflower strain?
No.

See why the form is so important.

You MUST check PH. Shoot for 6.5 as the goal.

This is such a small grow area I am not competent in this. Need someone experienced in these small grow box setups to chime in. I concern about the amount of air exchange.

The plants are showing need for nutrition, should not be that yellow at 12/12 for only 2 weeks. Can you repot into a little larger container with decent potting soil, MG only as a last resort. That should provide most needs, give a very, very small amount of nitrogen, which you probably gave with the MG nutes, so hold on that.

After a couple weeks in larger containers you might give a little unsulphered molasses.....a little.

What kind of 150 watt bulb is it, check ph level of water, make sure your nutrients are suitable for the flower stage and not veg state.....start by flushing 5 gallons of fresh 6.2 balance water no nutrients. the bulb should be a hps high pressure sodium or at least a metal halide designed for plant growth.....don't forget flush the roots really good add your nutri on your next feeding not this one........you must also insure AIR FLOW:rasta: