Dusters

[jtroutine]

I have some "dusters" on one of my rocks. I am pretty sure one is a feather duster I also have one that looks kind of the same but the "feathers" that come out on this one dont waive around like the other but more looks like a "sun" kind of hard to decribe. Anyway my question isnt so much the ID but rather what is the size range, right now they are only a 1/8 to 1/4 inch in size. They are really cool looking. I imagine they are "filter feeders"? Is there anything that I would want to make sure I had in the water for them to survive well? My guess would be they are hardy being they survived all the travel.
Here is a pic of one

 

[nacl-h2o]

Yes, they're feather dusters, and yes they're filter feeders. Usually there is no need to add anything extra to keep them alvie, but dosing something like DTs phytoplankton will feed them.