Cattleya potted in sphagnum moss

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Hi eveyone,

I bought a Cattleya aurantiaca from EFG orchids this Spring and now it is time to repot it. I have found that it has been potted in sphagnum moss. I am questioning the medium that it has been potted in, because eveything that I read says that Cattleyas need to be potted in a medium that dries out rather quickly. Do I go ahead and repot it with more sphagnum moss? Or do I use an orchid mix that you normally pot Cattleyas in?

Please let me know if you can help,

David.