Healthy vs Unhealthy Roots?

[reebs_225]

I'm brand new to this forum & a newbie orchid owner. I need help determining if my phalaenopsis orchids aerial roots / root system are healthy... They were both given to me as gifts 3 months ago. One has lost all of it's blooms & the other has lost about half, from what I've read this is normal. I water them thoroughly weekly with either distilled or rain water & allow them to drain. They are both planted in bark & are producing new leaves. They are kept inside my Florida home with temperatures at 74 during the day & 70 at night. I've included photos (first 2 are of one plant & the second 2 are of the other plant). The aerial roots are turning brown, but are not mushy. Some of the roots in the pot have the same appearance. Any advice would be helpful! Thank you in advance!!