I feed my tank DTs.
Just be sure not to put it to close to glass. Over the course of a year, mine found its way to the glass and attached itself somehow, so now I can't clean around it very well. See the lower right-hand corner:
<img src="http://i12.photobucket.com/albums/a240/techigirl78/featherDuster.jpg" alt="Image hosting by Photobucket">
It's kind of neat seeing the inside of the tube. It's been like that for well over six months now.