Great link Mike! I also use Lionfish Lair's Hitchhikers Guide site. She used one of my pictures in Cirratulid-Hair worm link.
View attachment 15425 Well now that my tank is doing ok. I just found a hitch hiker in my purple rock. When i get too close it pulls himself in like a feather duster. I never had a duster in here..but it kind of fans out and hides when i get close
Yes ive looked up some pics and close up it looks like the patternhttp://www.lionfishlair.com/wp-content/uploads/2016/05/bryozoan-right.jpg
It looks like Bryozoan to me, a good filter feeder.