I like to place the fan so the babies wiggle every once in a while.
helps build stronger plants.
The closer they are the better.
That's all I use in my veg areas.
Oh One Other thing, the spectrum of the bulb.
Anytime you use a single bulb/light source, make sure it's Full Spectrum.
I use shop light with 2 tubes,
one cool white and one warm white(bath/kitchen)
and since the usable light range with those floros is only 6-8 inches, as the plants grow you have to add&arch around the plants.