Pictures aren't gonna work.. Close one is way to fuzzy.. Far pictures don't have the resolution needed...
Try finding them here..
This site covers most of the "common" stuff found in saltwater tanks/on rocks,etc..
https://www.lionfishlair.com/hitchhikers-guide/
I find myself wanting to guess at colonial hydroids (Hydroids - Colonial in that link) based on the "things on stems" comment..