I have posted that I have seen them 5 times grooming the coral of algae, but they number in the dozens now some 4 inches long they are spooky lookingYes, I also use Poly-Fil from fabric stores as inexpensive floss. Personally, I like using live rock. There is a chance you can get an unwanted hitchhiker, but I believe the benefits live rock brings far outweighs the possibility of getting something you don't want. Pretty much everything can be trapped or felt with another way, including bristle worms, which I believe are beneficial (though a lot of people don't like them).


