Infamous Hydroid Jellyfish?

[AtlantiCat]

I hear tell there is such a thing as a small, white, spider-like doohickey called a Hydroid Jellyfish that is said to inhabit newer tanks.

Methinks this be the critter in question? I seem to have a dozen or so scattered on the glass (which probably means two dozen more hiding in the rocks).

 

[Kasrift]

Looks like it. They are harmless really and will self regulate. I had a scattered few when I started my tank and I never see them anymore.

 

[EeyoreIsMySpiritAnimal]

I hear tell there is such a thing as a small, white, spider-like doohickey called a Hydroid Jellyfish that is said to inhabit newer tanks.

Methinks this be the critter in question? I seem to have a dozen or so scattered on the glass (which probably means two dozen more hiding in the rocks).

Yep. Nothing to worry about