Where are you getting your media?
Use medium grade (about the size of a quarter) bark for phals- you judge media size by root size.
Thick roots- medium/large grade
Fine roots (like oncidiums)- fine grade (nickel to dime size)
For the moss, if you get it from a place like lowes or Home Depot, make sure it is "long fiber sphagnum moss"- not the green moss that they sometimes advertise for orchids.

And soak everything before use.
You were lucky to get a plant that was already in a clear pot!
Can we see pictures of what's going on in there, if you can get it out?