soft coral parasites

Hello everyone, newbie on reef tanks here, I had freshwater tanks for several years and now I decided to start a nano reef. I got these rock with these corals and: Is this a bristle worm on the first photo? I think that this area on the second photo, got smashed while it was being transported...

I found what I'm 99% sure is red Planeria on my soft coral. I'm experienced in the fish world but this is my first tank with Coral. I have some soft corals along with a bunch of fish. So how much do I need to worry about this? Is this something that may not cause any harm if left or do I need to...

I was doing a water change and noticed that there was some parasite in my frag sized green stare encrusting polyps, so I performed a coral dip with iodine twice and tried to scape off as many parasites as I could. After dumping the dirty water in the sink, I was horrified by what I saw and took...