things with tenticles

[pookman]

hi everybody! i was just admiring my tank and noticed on the live rock,these tenticles comming out of the rock. they have waht looks like stripes on them and there feeling around...also i noticed this thing that looks like a tina umbrella moving around the lr..has anyone have any answers? mike

 

[pookman]

yes it does move like a snail, where did it come from and do you know what the other thing i listed is..my daughter saw it first when it came half way out..she said it had eyes and looked liked a worm with antennas.

 

[pookman]

if anybody knows the tenticles came out of the rock and they look like baby brittle stars..can anyone confirm this is how they hatch?