White sand star?
 

Do these need to be kept in a sand bed aquarium? I have one that I am holding temporarily in a bare bottom tank but he's moving around way more than usual. I think he's looking for sand! Thanks

Absolutley!

It will perish without a DSB (established) where it can move and sift through the sand looking for detritus/fauna.

They are somewhat difficult to keep alive, even with the proper conditions.

Without sand it will starve to death. They should only be kept in a very well established tank. It's legs will most likely start eroding away or falling off.

Thanks guys he is now at a friends house doing ok!