I have no shrimp in the tank (that I am aware of or put in on purpose). I did feed the mushroom some mysis last night and although it was too weak to close around it, I could see its digestive organs working on the outside and holding onto some of it. It has regained a tiny bit of color, and I think its from the feeding so I will continue to try and feed it with pumps off, by hand, til it thrives or dies.