Small feather dusters taking over

[doublette]

Greetings All! I've been lurking here for a while and now have a question to ask of you. We have a 120G tank that has been running since the end of January. Over the last couple of months one side of our tank ( which also has lower water flow) is being taken over by the small feather dusters. They are almost covering the rocks, they come up in the brown stars, between the mushrooms, growing on the hammer...everywhere on that side. I never thought I would ask this question (I was soooo excited when they first started appearing)but...is there any way I can keep them from taking over the tank? Current tank inhabitants are a powder blue tang, two false percs, a cleaner gobie, one two-spot gobie, one emerald crab, a peppermint shrimp, a few hermit crabs and snails. You can take a look at these pictures to see what I mean...
http://www3.telus.net/public/dabbler...ters%20004.jpg
http://www3.telus.net/public/dabbler...ters%20002.jpg
http://www3.telus.net/public/dabbler...ters%20001.jpg
Thanks in advance for any help you can offer.
Debbie