Nudibranch?

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Hi all,
Anyone know what exactly this may be and if i should kill it?


Its the white looking thing to the right of the coral in pic. Best photo i could get.
 
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It comes out a hole in rock like stretching movement then retracts into the hole. Not fast, but seems to be staying in the same spot for nearly a week now
 
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Thats the biggest i have seen it. Otherwise when its in the hole u only see a bit of it. Almost like a lid with what u see there. Is it good or bad? I also found 3 sand sifter stars of mine missing a leg. Seems to have been eaten
 
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I googled some sea cucumber pics now. Those "flowers" thingies are not only in a mouth parts, on this one it seems all over down the back
 
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Thats the biggest i have seen it. Otherwise when its in the hole u only see a bit of it. Almost like a lid with what u see there. Is it good or bad? I also found 3 sand sifter stars of mine missing a leg. Seems to have been eaten
Just a question..?? Your sand sifter starfish. Are they all in one tank, could be because they starving to death... something to consider...
 
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I have 4 stars. But substrate is awful dirty. 3 have legs missing. Got them because substrate is so dirty.

I found one one google that looks like what i have


Would stars eat each other if there wasnt food?

Here is my substrate

 

EFJ

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@Fester just a observation. The growth on the sand looks like an algae bloom or cynao, and sandsifting star fish eat small live food in your sand and not algae. With that said, with there feeding habits helps move or agitate the sand thus helping with detris settlement problems. Also 1 would be enough for your tank, 3 is overkill as they will deplete their food source in the sand in no time and starve. Missing limbs is a common sign of starvation.
 

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