Is this slug with a tiny shell a good guy?

[leonardomanzano]

Sorry for the messy beaker, I recently bought some corals after a 6 month hiatus.
I dipped my corals and had these two slug like things instantly jump out.

They have this small shell but are predominantly slug like.
(I did not realize they had shells until after I picked them up with tweezers.)
They have brown/dark spots at their end of their body.
They have reddish tentacle that they appear to be using to touch their surroundings.
I noticed that they are more active when I put my flash light near the beaker.

((

 

[SanFernandoValleyAIOReef]

Yes they’re definitely good

 

[leonardomanzano]

Yes they’re definitely good

Thank you!
What are they called?
This has been one of my more effective dips but I am bummed out I might hurt some of the diversity I am reaching for in my tank.

I swirled the bag and found two brittle stars
I am hoping they will pull through.

 

[SanFernandoValleyAIOReef]

Thank you!
What are they called?
This has been one of my more effective dips but I am bummed out I might hurt some of the diversity I am reaching for in my tank.

I swirled the bag and found two brittle stars
I am hoping they will pull through.

Stomatella snails
I had some hitchhike in my tank and made lots of babies
brittle stars good too

 

[leonardomanzano]

Stomatella snails
I had some hitchhike in my tank and made lots of babies
brittle stars good too

Awesome! Thank you for this!
I am hoping they are a male and female pair!

 

[Bruttall]

Stomatella Snails are The Unsung Heroes of Clean Up Crew | Reef Builders | The Reef and Saltwater Aquarium Blog

One of the most unique and underappreciated members of the Trochidae family is the Stomatella Snail. With a thin, fingernail-shaped shell and a sea slug-like appearance, these snails are adept at…

reefbuilders.com