Hey there! If you read on this website about the feather dusters it says that when you put them in your tank, they wil float down and attach themselves to the bottom. I think it also says that it will bury it's base. It also tells you that they are very light sensitive. I'm thinking about getting some when I start my saltwater. (Yes, I am a saltwater novice!
) I have two freshwater tanks, and it's time to get the saltwater hobby. I hope this helps.
Patricia