Identify please

[Idaho-Tank]

This appears to be spreading in my tank. I Need help identifying this guy. It appears to be out more when lights are off and when the lights come on it shrinks. When I touched it, it would retract but slowly - not nearly as fast as aptasia. It almost looks like a mushroom when the lights are on but when the lights are off it looks more like an anemone with white balls or tips on the end of each tentacle. So any ideas?

Here are some photos of what Im talking about - this is not the same one but looks the same - its just that one was out of the light and easier to photograph. So here it is when contracted:

And here is a similar one that is shaded from the lights and not contracted.

Thanks

 

[Idaho-Tank]

After some more searching I think it is a type of ball anemone. I have also read that they can be nocturnal. Can anyone confirm the id?

Pseudocorynactis caribbeorum - The Free Freshwater and Saltwater Aquarium Encyclopedia Anyone Can Edit - The Aquarium Wiki

 

[Jimbo7]

I'd say your dead on.