Yes the brown things are aptasia. If you can target just the aptasia with a syringe with very hot water they will let go and you can pick them off. The other thing with the mouth might be a sponge.
Doesn't seem to look like any type of sponge that I can find right now. I will keep looking and I'm going to try and get a better video of this thing. It almost looks like the Zoas are attached to it so when it expands and contracts the Zoas move as well
brown ones deffo aptasia , the other thing is a filter feeder not sure of the name but their no harm at all ,iv got a few of them in my tank ,once it grows more it will have more mouths or holes whatever their called lol
If you can pull that rock out and QT the whole lot of aptasia, I would do it immediately. There are a lot of ways to kill them off. Aptasia X and other brands , kalkwasser, hot / warm water as mentioned so you can pull them off - which makes me nervous because anything left behind will regrow, lasers, etc. There are also predators for them - I'm sure you can find a ton of info here on the forum. Aptasia will sting your corals and reproduce like wild fire.
Use a syringe with hot water to target the aptasia. Usually you can suck them up with the same syringe they will just let go. I have done this it works well. Good luck.
If the hot water doesnt work, ask your LFS for Atlantic Peperment Shrimp, they tend to go eat appys very well. The pacific versions just give them a High Five when they are scurrying past.