Originally Posted by mudplayerx
Chocolate chip stars probably wouldn't be a good idea in a tank that small. They eat all of the beneficial fauna from the live sand even in a large tank. I don't know why they even sell them in the hobby to tell you the truth.
Those are sand sifter stars.
Chocolate chip stars are predatory and easier to keep in larger- non reef tanks.
This tank, IMO, is not suitable for harlequin shrimp unless only feeding asterina stars. A larger dying star in 2.5g? Likely to crash the whole thing, IMO.