Need ID to another hitchhiker coral?

[Fish Ed]

I bought an amazing red actinodiscus covered rock a couple of days ago and it opened up nicely. Something else opened up as well. At first glance, I thought it was a bubble coral then I took a quick research to find out they're aggressive. So that's crossed out since it's literally being slobbered by the mushroom. My second guess would be Cynarina.
BTW, it's squishy(if that helps with identifying it)

Any thoughts?


I hope its not some sort of pest.:worried2:

 

[ingtar_shinowa]

my bet is Cynarina

 

[JokerGirl]

Looks like the bloated foot of your mushroom... They'll do that if they are trying to move.