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Thats a dead Brittle Starfish.
How did you help themNot dead yet. I have brought some back from that point before.
Just to point out, Brittle Stars/Serpent Stars are not actually starfish (true starfish are from the taxonomic class "Asteroidea", while Brittle and Serpent Stars are from the class "Ophiuroidea"), and typically do quite well in home aquaria (though large, green serpent stars like the one the OP had specifically are known to prey on sleeping fish, so most people probably don't want to keep them).I want to say from previous posts that this is caused by either lack of stability in the tank as a whole, or starvation.
The large majority of starfish unfortunately do not survive in home aquariums.