Yesterday I went to my LFS and got four ghost shrimp, the next morning I went to check on them and discovered that one of them had a long, white string running through its body and making a loop near its head. I looked it up on the internet and now I believe it is a horsehair worm, which kills its host when it matures. I now have it in a hospital tank. Should I return it to the main tank, or should I keep it in the hospital tank? Thanks!