Bristle worms are the good guys, and part of your cleaning up crew, they won’t irritate your corals.
If you have too many and want to reduce their numbers I suggest doing so either manually or by setting up a trap.
There are 3D printed traps you can print at home or purchase them online.
Edit: As for actual pests, some gobbies may eat flatworms, though I wouldn’t lean to them as an affective alternative.
I’m afraid that even the smaller wrasses will get too large for your system.
If you have too many and want to reduce their numbers I suggest doing so either manually or by setting up a trap.
There are 3D printed traps you can print at home or purchase them online.
Edit: As for actual pests, some gobbies may eat flatworms, though I wouldn’t lean to them as an affective alternative.
I’m afraid that even the smaller wrasses will get too large for your system.