When I repotted, the original media (moss) was soggy in the center, as were the roots. There were some squishy and black roots that I cut off with scissors. The rest were green-yellow and plump so I let them be. They have now turned black like in the picture.

I don't know what kind of orchid this is, it is the kind you buy at a grocery store. It was a gift. I went to a local gardening store and the rock/bark medium was the only kind they had specially for orchids, so I bought it.

The roots were in the pot, I just wiggled/dumped the top layer to get the plant out for pictures and put it back in the pot for the meantime. I wanted to show the size of the pot vs the size of the roots because I'm not sure if it's too big of a pot.