...fish sood? I am assuming you mean fish
food?
what I would do, although I haven't had ghost shrimp before, is do a really big water change to try and remove most of the copper sulfate contaminants. Keep doing water changes daily and switch fish food, and be cautious about the ingredients! Your shrimp may not make it but you can still try. We live and we learn. Believe me, it took me four years to get the hang of this fishkeeping game
!
Good luck, I hope your ghost shrimp pulls through.