OK my sons posted this so let me clarify and give more info.
On my LR there are these animals with multiple long extendable white almot transparent tenecles. If you look in the LR to the source of the tenacles you can see a white body that opens up to reveal tenacles. Above the thicker white body opening with the tenacles are two black dots that appear to be eyes.
The tenecles search the rock and pull in particles. Then every no and again the critter will spit out a bunch of dusty stuff.
Any ideas? My kids think they look like miniture squid, but I hace never seen them out of the rock and neither have they, but from what we do see they look like squid embedded in the rock.
Thanks gang!!