Whats this?

[Rcpilot]

Can anyone help ID both species? I'm especially interested in the black ones.

Thanks

 

[msman825]

the black looks like sponge. dont see the second one

 

[Rcpilot]

Here's a better pic under actinic.

They are blackish in color. There is a gray dot in the center. Tentacles on the edges are very fine. Two distinct rows of tentacles. Tubes are about 1/2" -- 5/8" long. Polyps are 3/8" diameter. Tentacles are about 3/8" long. Very fine tentacles--almost like string. The tentacles appear stiff, because they stand straight out with no curvature.