Worm like object found dead in my QT

[corsicoreef]

Found this worm like object dead on the bottom of my QT tank, it's about 8mm long and 2 to 3mm of diameter.

The QT was setup using air filter sponges seeded in my 45 gal established tank.

I had two fishes in the QT, one very small longnose hawkfish that died this morning (7th day), and a Medium/Large Midas Blenny which is healthy.

Last night I added another filter sponge from my 45gal sump in-tank to the QT.
It was clean, no debris or critters over it.



Photos attached

Thanks!

 

[Subsea]

No idea. Bump

 

[Gumbies R Us]

@ISpeakForTheSeas

 

[ISpeakForTheSeas]

@ISpeakForTheSeas

My first thought would be a sipunculan (peanut worm) - harmless/beneficial if so.

 

[fishface NJ]

My first thought would be a sipunculan (peanut worm) - harmless/beneficial if so.

that is what I believe it is also