Hey possum, I edited your post to show the pic "inline" the sized pic is a link to the full sized pic, for those on broadband, or dialuppers willing to wait a few minutes
I waited, if I hadn't looked at the full size image, I would have had no idea what it was. It looks like a species of non-photosynthetic mushroom commonly found on Florida Aquacultured
LR. Pseudocorynactis cribbeorum
Here is a pic of one of mine...