please help a beginner understand potting and humidity.

[BigRed]

greetings fellow orchid enthusiasts!
I have a few beginner questions and would really appreciate any advice.

1. I have 4 orchids that live in a plastic pots that rest snugly inside of a glazed pot with no air holes. Will this cause root rot? I hear it does but I'm confused because when I bought my orchids from a nice locally owned garden shop they were in these pots. Do I get new pots? I just got an Ionocidium Popcorn 'Haruri' and I really don't want to kill it. It's gorgeous.

2. I know orchids need humidity and I see really cool set ups on this site all the time. I live in the Monterey bay area of California, about a half mile from the beach. My orchids live next too a sliding door I keep open during the day. Do you think the ocean air has enough humidity?

3. Today I bought an gorgeous ionocidium in bloom whose medium looks almost black! It' potted in fine bark mix. The top roots look dark green almost like moss is growing on them and they are stuck to the bark. I usually look for healthy roots and newer potting materials but I fell in love with this chid and didn't care about such things. The tag says re pot every two years, but I feel like this little gal has been in her pot for almost that time. Should I wait till it's done blooming to repot? Or should I operate?

Thank you for any help. My plants and I appreciate it greatly!