Was it das?

[Fortunato]

I noticed this little guy on the glass today. Anyone know what it is?

 

[Fortunato]

 

[Sharkbait19]

1/5 of an asterina star.
The rest will grow back, and you’ll soon have a lot of them.

 

[Fortunato]

Btw, it's about 1/2" for scale

 

[vetteguy53081]

Its a nuisance asterina star that will multiply like mice, get to your zoas and into your intakes, plumbing, overflows and pumps. Eliminate by hand as you see them

 

[Fortunato]

That sounds fun

 

[damsels are not mean]

Aquilonastra star (formerly classified as asterina). Harmless scavenger. Good food source for star-eating shrimp such as harlequins and bumblebee shrimp.

 

[Spare time]

That sounds fun

Harmless though