That is some mean coralline algae growth you have there, how long have you been cycling for? Where did you get the rocks from?
The weedy type stuff as mentioned is ok, but the little brown anemone things, Aiptasia, is something ya need to get rid of, and it will be what John was cutting out of the rock. You are bound to get them throughout ur experiences owning a reef tank no matter how hard you try to keep them away.
I'd suggest poping into Organism and seeing if John has any Joes Juice. Thats what I use on mine and it seems to work quite well
The bottom photo looks a bit like a feather duster or a tube worm. You'll end up with tons of those and they're beneficial filter feeders, nothing to worry about
Post pics up of ur whole setup, I'm always interested when a new CHC reefer starts up