So Far, So Good..?

Wassup everybody!
I'm on my 2nd grow (1st one was bountiful, but a disaster cuz I had waaay too many).
Now I'm just focusing on ONE baby. It accidentally sprouted from a houseplant's soil (a Philodendron that I transplanted from old Miracle-Gro soil...get this: I re-potted it using the same soil from the previous grow, lol)
So I call it my "Miracle Child", cuz it was a "surprise" (...like I was..LMAO).
It's about a month or two old now. It's in an old mixture of FFOF & Roots Organics. I try to throw it in the sunlight whenever I get the chance, otherwise it'll chill under a single CFL (23W, 5000K, 1600 lumens). Kinda looks like it has a lil light burn tho, so I'm thinkin about using kelp for the 1st time

Any advice for improvement? In ALL areas?
I'm still kind of a newb. Kind of.

How does a seed accidentally sprout?

No one in the home intentionally dropped a seed in the soil...like...w/ the previous grow, I couldn't support em..(financially ) + they were all male (....I think)...there were a buncha factors that screwed me up. So (some) eventually went to seed & a WAVE of spider mites took over in my absence..after that, I've been saving bagseed for future ventures. Now...that's the freaky thing. There's a crap ton of seeds that were intended for something, but this random ONE pops up...hidden beneath the leaves of a common houseplant. So I said "Fuggit. I'll take care of u. Just u."

Moving this to Organics

Currently between 2×23w CFLs
I have no nutes in right now, nor have I ever dealt w/ em. Now's a good time tho, right??

It's been a couple weeks, & my kiddo is on the (horizontal) rise.
We're pro-LST for the sake of space, design, light efficiency. I got it in a 2-2.5 G pot, recycled (approx. half organic) soil, we both chase the sunlight during the day, and when I'm away, under the CFLs it goes.

The bottom leaves are yellowing...and I'm not completely sure why. I pH tested & it came up neutral (~7.0), and the NPK in the soil seems OKAY.
Only issues I've had was light burn, and continuous foliar spraying (cuz the humidity's usually 25-40%)

Should I add lime or something? Cuz I have powdered eggshells on standby lol
Thanx!

Looks ok. I would expect that to happen in less than ideal conditions.

My bottom leaves get the least light and nutes and things poured over them from time to time. They die, but they don't nessesarilly need them.

So all is well until I beef up l'arsenale, huh...okey doke

THANK U, Jes- uhh, xSTTM..lol