Two days ago I found one of my mystery snails stuck to the filter intake. I thought she was just cruising along or found some type of food on it. Well, after being there for half a day I reached in and slowly removed her from the filter intake. I set her down and she hasn't moved in 2 days. I thought she was dead, as my snails are very active. But my boy snail was mating with her (twice) during these days of no movement. So I figured that my boy snail wouldn't mate with a dead snail. Today I dropped in some algae wafers and wouldn't you know she opens up and is eating as I type. She scared me! She does look a little tore up...her shell is fine, but her feelers are a little shorter than they use to be and her siphon seems to be bent. But she's eating and moving so I'm a happy snail keeper.