ID White and Grey Starfish?

[mickeyfish]

So this guy recently made his way out from within my live rock and I cannot tell or find any info on what it may be. I have historically had a few Asterina starfish, but those are about the size of a penny. Stretched out, this guy is between quarter or half dollar size. He has active tube feet for moving (super slow).

It has 4 legs only and crawled out of my rocks. Have not recently added anything to the tank. Any ideas?

 

[Reefing102]

I honestly have no idea. But pretty cool looking

 

[cal_stir]

Check out this carnivorous sea slug

 

[kfisc]

I looked up sea cushions and everything else four-legged, but nothing seemed to match. I'm going to guess either some sort of mutant or it will eventually grow another appendage.

 

[Reefing102]

I looked up sea cushions and everything else four-legged, but nothing seemed to match. I'm going to guess either some sort of mutant or it will eventually grow another appendage.

That’s where I was headed. Almost has the coloration of a sand sifting star

 

[mickeyfish]

Fun update. It split in half and half receded back into the rocks and the other half is climbing the glass.

 

[kfisc]

How cool. Hopefully you won't get a tank full of those things and that it's not the kind that devours things you want to keep.

 

[cal_stir]

I would be worried, I would remove the one if you can and isolate it.