Seedliing is stunted in growth? And yellowing

This seedling is about 9 days old. It started growing quickly, by day 2 it has the true leaves poking out but somewhere along the way it stopped growing and started yellowing. What can be the cause? I do see little sprouts growing in the middle of the first set of true leaves but I dont think the true leaves have grown enough to start growing a second set already?

I'm a noob and I only intend on growing this one plant, more for curiosity than anything else so please help me save it/ fix what's wrong.
 

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More pictures for reference. I have this plant under cfl 80 watts (2 40 watt bulbs) overnight and I live where it's always sunny so I put it outside from 7 am to 5 pm in (mostly) direct sunlight. Water probably once a day, drainage holes on bottom of cup. I keep the light about 3-4 inches away from the light.
 

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Cant see too well but it looks like you have a lot of wood chips in the cup ?, could be stopping root formation and keeping the media really wet.
 
More pictures for reference. I have this plant under cfl 80 watts (2 40 watt bulbs) overnight and I live where it's always sunny so I put it outside from 7 am to 5 pm in (mostly) direct sunlight. Water probably once a day, drainage holes on bottom of cup. I keep the light about 3-4 inches away from the light.
What kind of dirt is it in? Water PH?
 
The cotyledons are yellowing. I think I see a little yellowing on the tip of a newer leaf. Now here's the thing...I know you'll be tempted to add fertilizer but don't. If anything you can give it a weak hit of mag. Epsom salts if ya got em. I wouldn't do anything else. My instincts tell me its your soil that's making them yellow...but that's just an educated guess. Let's see how they do in a few days.
 
Updated picture. The medium is a compost potting mix...

I recently changed the soil from ecoscraps potting mix to black gold until I can get something better ordered (hence the wetness of the medium atm)
 

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The cotyledons are yellowing. I think I see a little yellowing on the tip of a newer leaf. Now here's the thing...I know you'll be tempted to add fertilizer but don't. If anything you can give it a weak hit of mag. Epsom salts if ya got em. I wouldn't do anything else. My instincts tell me its your soil that's making them yellow...but that's just an educated guess. Let's see how they do in a few days.
Do I dissolve Epsom salt into water and water it? Is there a specific ratio?
 
Could lighting be an issue? The sun is blazing hot during the day and I keep it outdoors from sun up to sun down, then have 2 40 watt cfls 4 inches away overnight. Too much heat?
 
Pictures from today.... its growing...but not much and the yellowing is getting worse.
 

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More pictures for reference. I have this plant under cfl 80 watts (2 40 watt bulbs) overnight and I live where it's always sunny so I put it outside from 7 am to 5 pm in (mostly) direct sunlight. Water probably once a day, drainage holes on bottom of cup. I keep the light about 3-4 inches away from the light.
They look great for a day’s time mine aint even half of that
 
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