When having a conversation about bristle worms, and whether or not they are beneficial or harmful, it is helpful to keep in mind there are many species of dramatically different sizes. The diminutive bristle worms grow an inch or two at the most. They are very thin and typically considered beneficial and part of the clean up crew. However, once upon a time I was overfeeding a tank (newbie) and the tiny worms did what they're supposed to do when there is an abundance of food - breed. Short of that experience I would recommend ignoring them. On the flip side there are HUGE bristle worms (AKA fire worms) that grow a foot long and as big around as your finger. Those are NOT okay. Besides being dangerous to the aquarist, they can damage coral and livestock. How do you know you've got the wrong type? They grow and grow. If your bristle worms get more than diminutive in size, don't wait until they are monsters. Go ahead and try catch and remove the large ones with the technique mentions above.
Here is an article that goes into more detail.
www.aquariumsource.com
Here is an article that goes into more detail.
Bristle Worms In Your Saltwater Tank: What You Need To Know
If you have bristle worms in your saltwater aquarium and aren’t sure what to do, you’re not alone. Fortunately, this guide will answer your questions!
www.aquariumsource.com


