Man I have these in my tank, always have but lately their population has exploded and they are really everywhere. I am searching for the name of them and i think they are pretty common. They are a small hard tube almost like a tiny feather duster but they send out small long strings like thread out into the water and catch things drifting by, then pulling the thread back in kinda like their own personal fishing rod. Anyone know the common or scientific name of these critters?