feather dusters

I recently got back into the hobby and purchased a 46 bowfront from a friend at work. However, the tank was over run with huge groups of feather dusters. they were all over the tank. I managed to clean off most of them when I moved the tank and I cleaned the live rock really well. My only concern is I do not want them to take over the tank again. Is there anything I can get that will keep them in check.
 
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