huge wildcate orchid, newbie owner!

[pickmary]

Hello all, I need some help with this beautiful wildcat orchid i was given! I have had grocery store orchids before and have done ok in keeping them healthy with doing some basic research, but this one is the biggest i've ever had, and i'm not totaly sure that its even that healthy at the moment. My mom bought it for me at an orchid show, and so i assumed it would be on the healthy side, because those people are pros, right? Well i've attached some pictures i took, the roots look a little crowded to me, and there is some black marks on the leaves. I have read that the black marks are not likely a problem, but the roots may be. They are planted in a Ming moss.