So I just switched about a month ago to my new 92 gallon! Love it. I recently banded some Zoas to a rock that has been a part of all of my tanks as I've upgraded. When I looked today at my Zoas low and behold, I have a feather duster! Not trying to be dumb but where is the likelihood this came from? It's tiny! I guess it could be a hitch hiker. The only new purchase really was the day I set the tank back up, I put in a new fish, and a new pink hammer coral.