What Is It?

[nismo driver]

not sure if this is the right place for this but what are these little polyp looking things?

 

[InvaderJim]

2 and 4 look kinda like majano anenomes.

 

[Paintbug]

those are Corynactis spp. often called ball anemones. heres some info at the bottom. http://www.advancedaquarist.com/issues/oct2002/invert.htm