It seems a few feather dusters are in one of my new Acro frags. A few places where a polyp should be I can see feather dusters feeding. I think it’s bothering the coral. If I take it out and dip in corarx will that kill the feather duster? How can I get rid of them? My only thought besides dip is to take it out and put a drip of glue to seal them in. Just might be tough to remember when it’s out exactly which holes to plug.