I have a seething mass of reddish brown worms (at least I think they are
worms) in a piece of live rock down by the substrate. Today a piece of
shrimp floated down to it and the tentacles all wrapped around the shrimp
and pulled it in. A snail wandered over and the tentacles wrapped around
the snail. I have white spaghetti worms in my tank and they act nothing
like this mass. It looks nightmarish and acts predatory. The tentacles
actually wrap around its food and drag it. If you know what it is, please
tell me. If you know how to get rid of it, even better!!

--
Ann R