trouble shooting my orchids for root rot, etc

[myshka]

maybe i'm just worrying too much, but just in case, i have some specific concerns about my new orchids.

i just bought these two plants a few days ago.

i bought them both from lowes and they were in moss-type medium with a lot of rotten roots. i repotted the pink one because it looked like the medium was causing too much rot. but immediately after repotting i noticed that the flowers started drooping.

i know you're not generally suppose to repot while they're in bloom, but i felt like it was a choice between severely damaged roots or pretty flowers.

anyhoo, some parts of the plants are blackish. what should i do about these spots? will the orchids be able to remove them on their own or should i be taking some other actions?

also, (only) one of the leaves has an uneven green tone. it's been like that since i got it.

i'm including a picture of my dog just for funsies. couldn't have camera time without including him.