Starfish ID?

[WhitePanther93]

Do asterinas ever have red on them?

 

[Mechano]

Do asterinas ever have red on them?

Definitely looks like an asterina.
Maybe it’s from coraline they are eating?

 

[ISpeakForTheSeas]

Do asterinas ever have red on them?

Yeah, that's an Aquilonastra starfish (known in the hobby as Asterina starfish); a few of the species have red patterning on the body.