Mystery Zoos - Bright Yellow Centers

[OzarksReef]

I just purchased a cup mushroom and noticed some hitchhikers that came along. Are those zoanthids with a bright yellow center? And what about the orange things - sponges?

 

[650-IS350]

I've got the same... very tiny though

 

[Bebo77]

dont think those are sponges.....

 

[650-IS350]

probable tunicates