On Sunday I noticed one of my yellow shrimp on it's side and it wasn't moving much. Every once in a while it would move a leg or two. So I didn't think much about it. I thought maybe it was something to do with it molting. Later on and I go back to find that it's dead and being ate by snails and shrimp. Two days later and the same thing happens to another shrimp. Today it happened again. That's 3 shrimp that I know of. My tank is heavily planted and I can't see everything, so could be more. My question is... does anyone have a clue why this would happen all of a sudden?