The branching things are definitely hydroids! I might cut the stalks off and see if that fixes that problem. They're not causing any dramas that I can tell, but they're very small. I might keep the pseudocorynactis for a little while. It's not harming anything now. It would be easy to get rid of it with aiptasia x if necessary.That's some great live rock you have there! I spot sea squirts, feather dusters, and a million types of algae.
No clue what the 'propellers' are but could be hydroids.
The final pic, albeit blurry, looks a bit like a pseudocorynactis - orange ball anemone. Generally not reef friendly as they are very sticky and can eat 'stuff'.