I have some little brown plant-looking things in my aquarium. They almost look like feather dusters only smaller and more bland. I don't have a picture but mentioned it to someone else who has a marine aquarium and they knew right away what they were. I thought they said it was astaria but after browsing on here it looks like that is just a snail. This other source said that they were not a good thing and to get rid of them but did not say how to. Does anybody know what I'm talking about and what to do about it? I'll try to get some pics to put on here if nobody knows without seeing them. Thanks!