some pics from longboat key..
100_3829 by EricHYoung Photography, on Flickr
100_3826 by EricHYoung Photography, on Flickr
Some algae's I found..
closeup.. off of each stem is what looks like feathers. very very fine
Tunicate cluster, shows white in the pics but when viewed from above it has a flourescent green/blue tint to it