What is this?

[Luisc3181]

Found this cool hitchhiker on some live rock I picked up. Not sure what it is. Was attached to the rock line the nems attach. It's neon green with red. Or is a shroom?

 

[Speaker73]

Maxi mini carpet nem maybe?

 

[Luisc3181]

You might be right. It does have a small mouth in the center.