I took out my Oncidium from it pot and i was shocked.

my mom who repotted my Oncidium, put soil as it potting media. no wonder it was dying. anyway I read a thread that said hydroton was good for Oncidiums. i was wondering on what eveyone else's opinion about and what other potting media there is that good for oncidium. right now my orchid is hanging and drying out from the long exposure to moisture just for over night. anything else that might improve it health please tell me about it. thank you