Hey what's up man.
I have the same free seed from greenhouse and am growing under cfl's as well
The big bang is very sensitive but a survivor
when mine was about a week old it stopped growing and the new growth became dark purple.
I was about to give up on her and toss her but a week later...
I bought one of these when I started a few years ago
mine is a honywell with a similar cartridge filter.
I run mine 24/7 usually and just bought carbon sheets and cut them to size as replacements as well as adding a few layers.
My Area is 2x2x4.5 and it scrubs very nicely outside the tent...