I dont think bristle worms are harmfull to corals. I believe they are just a benificial scavenger.If that anenome looking guy in the second pic moves from zoa colony to colony I would remove it. I tried to focus in on the 1st pic , it appears to me there could be a nudi pokin out from behind a polyp but i'm not positive. Inspect all of your zoos closely as the nudis take on the color of whatever zoo they are munchin on.You may want to try a dip for the pox and see if any harmful creatures fall off. If you have nudis they are easily handled by a wrasse.