king has good advice and has lots of good info....
But everyone has to find what works in their situation so no on medium is always right for you I agree with king totaly on no moss ....BUt their are otheres that love growing in moss so we all have to find our best medium that works for each of us.
I my self use rice hulls and get tremendous results.Bark is always a dismal failure for me.
AS for spraying leaves for me that one is in the air as to wheater or not you should since I myself do and I have never had a case of rot of any kind ...but You must keep in mind my phals live in a house with wood heat in winter so it is very dry and they dont sit wet very long and I usually have to spray a second time in 10 or 15 mins.....I am realy not trying to wet leaves as much as the areial roots my phals have everywhere and it is a fertilizer mix not just plain water.
summer sees them sitting outide under a big cypress tree and LOL there is a roostin colony of black birds in spring so the get covered in bird lime at times and need washed a few times but man do they like it .
here is a link to a picture of my biggest phal at the moment ...all of the air roots are from this winter inside and the pot has just as many in the rice hulls.
http://www.orchidboard.com/community...-phal-now.html
as far as is the one from home depo being healthy ....looks very nice to me and I see lots with bud blast at hd thats just from the stress of being shipped ect .....all of my phals are Hd plants and so far I have only lost one over the years and that was my fault not a bad plant the roots on yours look very healthy in that clear pot