It’s one of those things that are debatable. Some people remove them and some keep them. I had a few and just left them unless it was easy to remove. They never seemed to harm anything in my tank and actually helped get ride of left over food and dead cuc. However there are some which are harmful to your reef so if you can get a good pic there is a thread that’s dedicated to the harmless and harmful types. But more then likely it’s harmless.