Like your scaping, Justin.
Reminds me of a canyon. Swweeeee.....
The anemone seems like a majano anemone.
They are considered a pest.
But these are not very reproductive.
Once they find a suitable location, they will stay rooted there.
If you do not mind, you can leave it alone.
I had 3 and got rid of 2 cause I needed the space. (my tank is a nano)
The last one standing is one of my luminous exhibit in the tank
Bristleworm - I had small fishes in my tank. I also have snails without shells in the tank.
None of them had been attacked by the bristleworm.
I know there are still 1 - 2 worms in the tank.
For my case, I'd just let them be.