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Pretty much any sea star would work, the lionfish won't eat it.
I would be concerned about a natural food source instead of the growth rate.
Just "any starfish" won't work. Linkias for example shouldn't be in a small tank. We don't understand their diet well enough to feed them directly and they will quickly eat their entire food source in a small tank, then slowly starve to death.
Perhaps look into Fromias. They look a little like the Linkias, stay small and it's possible to directly feed them.

