How's it going all?

I have a few questions about my current grow... This would be my 3rd or so over the years and have some questions about maximizing my yield... or at least not to jeopardize it (Sorry no pics at this time)

Quick overview...

Strain(s):
-No idea... bag seeds, but of good quality (from the look of the plants so far, some are a sativa dominate strain and just the opposite for the rest, indica dominate)

Soil:
-Experimenting with 2 types:
1. 5-1-5 normal potting soil mix (soil has lighter/airy texture) - I used this for all of my germinated seeds. After 1st transplant, I only used with half of the plants
2. 10-5-5 (completely organic, has a heavier texture) - I used this on the other half of the transplanted plants

Lighting (24hr veg - 12hr/12hr flower):
Three sets of 4-Tube (4ft long w/ veg or flower lights) T5 54w lights maxing at 20k lumens each set

Nutes:
Vegging:
-All natural 9-4-4 (w/ micro nutes Ca,S,Fe) made from hydrolyzed fish, bone/blood meal, sulfate of potash
-Standard 20-20-20 fertilizer

Flowing:
-Super Bloom 12-55-6 (w/ Fe)
-Schultz Plant food 10-15-10 (w/ micro nutes Fe,Mn,Zn) liquid feed

Current Stage: Vegging (w/ some having signs of pre-flowers). Most plants seem very healthy. The oldest plants are a little over 4 weeks old (from germination)

Before the questions start I want to point out a few things... When transplanting for the first time (from a ~3 cup(~700ml) to 3quart (2.8L), I used a teaspoon or so of the natural vegging nutes and thoroughly mixed into the soil. Also, I only watered with 20-20-20 ferts once at about half strength. The rest of the time only tap water was used (let it sit out for 1+ days, water is perfect - ph, Hardness, NO2, Chlorine, KH)

Question #1 (easy one):
-What are some signs that i may need to add some Magnesium? Epson salt? and how much should i add?


Question #2:
-Some of my plants are showing their 1st signs of pre-flowing. At this time i can not completely tell sex. They are just very small nubs at the nodes. The plants are about 10in tall and have a lot of foliage but not too disproportional (probably due to massive availability of N). My planting pots are 3 quarts(2.8L) and I cannot transplant into larger pots due to some restraints.
Considering the size of the planting pots should i start to flower the plants at the 1st sign of pre-flowers?


Question #3-4-5 (This is where I cannot find a precise answer or a "how-to"):
-If i do decide to start the flowering stage, how should I start this process? I have found many different ways. Please tell me the best way (or your way) to initiate this process: (give your opinion of the following list on a scale of "good" or "bad" or "yes" or "no")
A. Keep plants in complete darkness for 24hours then move to 12/12?
B. Immediate use of one or both of the flowering nutes (stated above) to start the flower stage? which?
C. Do i add full strength on the 1st day of flowering? (Please add comments of flowering nutes and how much(%) and/or when to administer.)


Question #6
-How do i build a time machine to skip 2 months into the future to sample my hard work and dedication? ... Haha do not answer this one


Thanks to anyone in advance...


P.S. I cannot find a good soil PH tester...
iamm420 Reviewed by iamm420 on . Some questions, growing, nutes, flowing... Need advice How's it going all? I have a few questions about my current grow... This would be my 3rd or so over the years and have some questions about maximizing my yield... or at least not to jeopardize it ;) (Sorry no pics at this time) Quick overview... Strain(s): -No idea... bag seeds, but of good quality (from the look of the plants so far, some are a sativa dominate strain and just the opposite for the rest, indica dominate) Soil: Rating: 5