Help identify

[tie1on]

Found several of these in my sump attached to the macro algae as seen in pic. Saw 2 larger ones that retracted into the marine pure block when I tried to grab them. They have dark purple/maroon arms(?)

 

[tie1on]

Here's the one that retracted.

 

[DSC reef]

That looks like aptaisia. Not a good hitchhiker.

 

[jrwoltman]

I agree with @DSC reef, KILL IT!!!

 

[DSC reef]

Try to remove it from the tank before disturbing it/killing it.

 

[tie1on]

So...before getting your responses,which I appreciate, I emptied my refugium. I found about 2 dozen. In the chaeto and in my Marine Pure. I ditched everything, thinking there were some I couldn't see. I scoured my display tank I don't see any up there. Hopefully the absence of a refugium for a few days won't be detrimental.