Trust me my friend, with a tank this size, you'll be glad you QT. Just make sure you're consistent and QT all your fish as they come in. I know for a fac that QTing my fish has saved my display tank in the past. Yes, I've lost a couple fish to ich in the QT despite treatment....but ya know what?? I'd rather lose one fish in QT than the whole display tank. I've played that game before and it's not fun.
I love my Midas blenny, and I bet you will as well. It's the most recent addition for my tank so it had a few days of hiding from the current residents before it came out. Now it swims all over the place.
Funny thing you mentioned the Anthias. I don't think they're that hard to keep and feed at all. I don't know what species you were thinking of getting, but Evansi, Dispar, or Bartlett's are relatively easy to keep and can be simply fed with a cheap auto fish feeder stocked with pellets, and of course a nightly mysis meal. For a beautiful 200g DD tank, imagine how awesome a school of 6 Evansi's would look!