Greenie thing?

[PicassoClown04]

I’ve had this pebble for a while now, it came from the sump of a very established tank. I’ve watched this thing grow from a pinhead into about the size of a penny (now). It’s soft and the edges can fold up. It does not extend tentacles or show any change at feeding/ night. Can anyone ID? I was thinking maybe some sort of shroom maybe?

 

[KJ]

Look like Rhodactis .sp

 

[PicassoClown04]

Look like Rhodactis .sp

Thanks. I have another orange and blue rhodactis... I guess I don’t know what the babies looked like. I thought mushrooms grew from splits but I know this one grew from a spore or something