Brassavola care?

[Chris147]

I recently purchased a brassocattleya kosh wallis at lowes. It looks great. It even has 2 sheaths. The sheaths are sort of green, but don't see anything in them. It has 3 new leads that were bent due to the fact that it was a bag baby. The medium doesn't look that good, there is some sort of white stuff on top of it. Should i repot it? Will it hurt the sheaths?

This is the whole plant. There are over 20 pseudobulbs


This is one of the sheaths


This is the sick looking potting medium.