hickhiker is hurt

[camaro68]

We bought a ton of LR at the LFS and the girl pulling out the rock said it brissle worms on it, but on the way home I looked in to find it was a brittle starfish. I had my husband floor is and we got it home right away and put the rock with him in it into the cycled seahorse tank.
I feed him frozen mysis shrimp when I feed the SHs. He is eating well, but when he did come out the front of his skin was missing but not decomposing (sp?) and I could see the inside that was yellow kind of gold color. His arms are gray very plain.
What kind is He?
Thanks Mandy

 

[ophiura]

There are well over 2000 species of brittlestars so it is impossible to know from this description, and without more specifics on the origin of the rock and a picture.
The animal may recover easily assuming water quality is ideal (specific gravity should be 1.025-1.026 - lower than this is stressful). If it is eating this is a good sign. Keep getting food to it and keep water quality stable and hopefully you should be OK.