Miltonia Regnellii with dark brown roots

[idreamoforchids]

Hello folks, this is my first time posting to this forum, and I'm a newbie to this site--and to orchid care for orchids other than phalaenopsis. I acquired my first Miltonia Regnallii last week, on sale because the roots weren't visible through the pot. However, lots of roots are growing above the bark (Orchiata), and the plant is flowering. Many of the roots are dark brown except for the base, and they feel dry and definitely not mushy to the touch. There are also a couple of dry spots on the leaves, with one leaf being a lighter yellow near the top of the leaf compared to the bottom of the leaf. I'm wondering if perhaps the orchid has not been getting enough water? Or might too much fertilizer be the issue? I've attached a couple of photos. Any advice would be much appreciated!