Space Travel

[Waterworld]

Can anyone id this life form. Noticed it in one of my tanks. 
It’s at the center of the screen off to the left (looks like a rocket)  

Friend or Foe?

 

Thanks!

 

Edited December 5, 2021 by Waterworld

[DaJMasta]

If it's flat and moves around, it could be a flatworm of some kind - difficult to ID unless you see it doing crime in your tank, but there are a number with that sort of split tail look.

If it's stationary and sort of 3 dimensional, could be a pineapple sponge.

Either is reasonably likely to be harmless, but some kinds of flatworms have a specific diet that we wish they didn't.

[ReefdUp]

Acoel flatworm... these are the non-nuisance type.