Coris Wrasse is my suggestion. I wouldn't worry too much about the skimmer personally just keep up the water changes. If you are doing 15-20g water changes weekly and have a good amount of live rock, you will likely be fine. Water quality isn't as big a deal if you are fish only with live rock (FOWLR). I would suggest some good flow near the bottom of the tank though. Dead spots in flow in the tank could be very bad.