Grayish/brown/purple?! Leaves, I have no idea what color they are!

I could really use some help here guys. I have three plants and two of them are doing good but this is the smallest one and both bottom leaves are turning like gray/purple and it looks like tiny white dots in the picture but they're tiny and they don't move, so I don't know what that is. This plant originally was doing the best of all three but now hasn't grown much for a little while. I really haven't got much help from anyone else so I'd appreciate if someone threw me a frickin' bone here.

How long has this problem been going on? About a week
What STRAIN are you growing? Bagseed
What was the establishing technique? (seed or clone?) Seed
What is the age of your plants? 2 weeks 1 day
How Tall are the plants? 3"
What PHASE (seedling, vegetative or flower) are the plants in? Vegetative
What Technique are you using? (SOG, SCROG etc) Neither
What size pots are you using? (Include how many subjects to pot) 3" pots/1 per pot
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) Miracle Grow Organic with 50/50 perlite
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* None
What is the TDS/EC/PPM of your nutrients used? Unknown
What is the pH of the "RUN-OFF"? I only know the pH of the water I use and it's 6.5
What method of pH test was administered? Using Strips? pH pen? Strips
How often are you watering? About every 2 days
When was your last feeding and how often are you feeding? N/A
What size bulb are you using? 7 26W CFL (5 3000K & 2 6500K)
What is the distance to the canopy? 11"
What is your RH Factor? (Relative Humidity) I don't have a humidity meter
What is the canopy temperature? About 78
What is the Day/Night Temp? (Include fluctuation range) Day is about 78 and night is about 75
What is the current Air Flow? (cfm etc.) 2 6" fans 1 intake/1 exhaust
Is the fan blowing directly at plants? no
Is the grow substrate constantly wet or moist? Moist
Is your water HARD or SOFT? Hard
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap
Has plant been recently pruned, cloned or pinched? No
Have any pest chemicals been used? If so what and when? Not yet
Are plant's infected with pest's? No

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Is the fan blowing directly at plants? no
Is the grow substrate constantly wet or moist? Moist
Is your water HARD or SOFT? Hard
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap

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I'm not an expert so wait for them to come along but to me it looks and sounds like a mould or fungus.

My tuppence (2 cents for all you Americans ;) )

You should have an oscilating fan that blows directly at the plant creating a gentle breeze and circulating the air.

Your medium should not be constantly moist because you should only water it once the plant is thirsty again and the medium has mostly dried out.
How often are you watering?

And you are using Hard water which I have no experience with but you take it straight from the tap which I think I know is not good.

It's your soil. MG Organic has a lot of nutrients in it, and it is too much for seedlings. That purple is from your seedlings being fed too 'hot' too young, and they will grow out of it. Make sure you are letting the soil dry out pretty well between waterings. Also, get your water pH up to 6.8. MG Organic is peat and is prone to becoming a bit acidic; it drops over time.

You will be ready to give nutes at a low dose when you see the 5th node forming and re-pot to the next size up, which should be a 5-6" pot with GREAT drainage.

EDIT:
Tap water is almost always FINE. Please don't try to answer problems when you've got no experience of them.

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EDIT:
Tap water is almost always FINE. Please don't try to answer problems when you've got no experience of them.

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My apologies but I've read so much in so many different places about hard water problems that I thought I was helping, and I did point out that I'm not an expert and not to act on my advice aloone.
I'll just stick to what I actually know from now on. :)