ID pleas

[new2dis]

I have never seen this anywhere and can't find it on the Internet. It has grown on a rock pretty much in the dark has arms that look like individual feathers. Does not retract when touched. Deep Blue in color with a dark green/blue on the underside. Really kind of pretty just don't know if it is bad for the tank.

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[REBridges]

Maybe a type of algae or sponge???

[ramsey]

Could it be a feather starfish?

[new2dis]

I guess anything is possible not sure how it would of gotten there. Kind of makes sense though

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[aceer15]

2nd feather starfish, I've seen them in red but not blue. Other than color it's identical


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[ramsey]

I think scutterborn recently found one in his tank that just appeared out of the blue.