I have two black and white misbar clowns, which are awesome, and fat, hopefully one day a breeding pair. And I also have a feather duster that hasn't been opening fully the past few days and i just found out why, my clowns attack it and sends it back in its tube. Now i have had this feather duster for about a year and the clowns since february. Why would they all of a sudden would they start doing this now? That feather duster is my main attraction in the tank along with the acans....whats up with them?