Water Snail Not Moving Much/Has White Goo/Mucus in Shell

[Allie]

Hello, 

I noticed today that my water snail has some white mucus in his shell. He haven't been moving too much recently and I am not sure what is happening. He is still alive and moves around, just not as much as he used to. Currently he is partially out of his shell but is still alive. Please help! I want to help him sooo bad :/  

[littlegoldsnail]

What kind of tank is he in? How big is it? What are the water perimeters? Do you know what type of snails he is? Is there a chance you could post a picture?

I would recommend doing a water change ASAP, and checking the water perimeters (via test kit). He could be struggling from ammonia or bacteria bloom (AKA New tank syndrome).