Please Help Identify

[dogstar]

I dont think its a Pipe Tubipora sp. but is a very simular Clavularia sp., type of Clove polyp.

 

[eastland]

Dang, Yosemite Sam is on top of his game ! (I love learning this stuff for FREE)

 

[fishdoyle]

I still haven't figured out what these are; they have grown by more than 5X. They have also changed in appearance.
Any additional ideas of what these are? Two pictures; the first when the lights first came on and the second a couple hours later.

 

[teresaq]

toadstool leathers

 

[mx#28]

Yep, toadstools.
This is an interesting old thread with lots of guesses on the ID. Some said Goniopora (has 24 tentacles per polyp) and others said Alveopora (has 12), but if you actually count the tentacles on each of the young polyps, there are 8.
8 tentacles = Octocoral (aka 'Softies', 'Leathers', etc).