Lots of Problems, Lots of Questions

[MeAndMyPhal]

Hello everyone!

My wife and I decided to buy a Phal from a big box store, shortly after that I became impatient and I repotted it in a bigger pot and sphag mix from repotme.

Things I now know i did wrong
- I bought a fairly large pot (5in)
- I overwatered (all the time)

to me, my phal looked fine; it was producing new leaves, and new blooms.

I read alot about S/H and decided I wanted to try it. I bought a S/H kit from hydro-orchids and when i attempted to repot in S/H I realized the damage I had really caused to my poor phal
- i had to trim a significant amount of roots (there really isn't much left now)
- due to the over watering I appear to have a crown rot issue


Now to my questions
i dabbed the crown with HP and dusted with cinnamon
What should i do now?

I have soaked the LECA in KLN already
should i move forward with repotting in S/H even with the shallow root system?
what about the crown rot?

I am also worried about lighting, there isn't a decent window in my apartment that will get very much sun

I got in way over my head and didn't really do my research and i need your help digging myself out