Anyone know how to get rid of this red algae bc I’m new to the hobby and I don’t like how it looks. Also will it mess with my corals bc it’s starting to get on a rock that has my zoa frag on it

Just got a Kenya tree coral and this came off of it. It looks like a bristle worm but this and a zoa I got today were my first corals. Can anyone clarify if it’s actually a bristle worm bc it looks nasty so I got rid of it.

What can I use to clean the outside glass on my tank? There are some small spots from the last time I tried.