Need help with this, havent heard of it before

Ok so my tree is a week and 1/2 old. It has 5 sets of leaves growing out but the branches aren't growing up and out. Everything seems to be growing too close together. I have about 3,000 blue lumens and 2,700 red lumens. The red is about 8 inches away "hoping it would grow up some but didnt yet" and the blue is on either side about 2 inches away. The 5 sets are all growing withing about 1/2 centimeter on top of each other. My last plant was tall and bushed out, this one not so much. I am using miracle grow potting soil, a fan and about 1 1/2 feet width grow space and about 4 feet tall. Also I have a bit of yellowing on the sprout leaves at the very bottom and then the first grow leaves the tips are a bit yellow. What should i do as this is my first real attempt at growing and i want a success even if its a small one ^^ any info I appreciate

Don't use Miracle Grow soil. You'll save yourself a lot of grief. Use Fox Farms Ocean Forest or Pro Mix, but mix a little Perlite in with them to help with your drainage. As for your plants, dunno, a picture would be helpful, sounds like the roots are growing and taking hold. Just be patient. You won't grow killer dank in a week.