Fish habitant: 1 Betta, 1 zebra danio, 1 snail - don't know the breed
Tank contains: aquarium pebbles, driftwood with plant.
Background: all happy and getting along in old tank
On Tuesday I bought a new 19 Lt Fluval chi tank as the old one was just a cheap nano tank not wanting a large setup being my first time fish keeping. While moving everything around I noticed that my snails shell had deteriorated. (Reading online maybe calcium is needed) on Thursday I moved snail and fish into the new tank one water was at 7.0. Friday I notice my snail coming to the surface almost like to breathe (I have video footage) then tonight Saturday he came mostly out of the water feeling over the lip of the tank and my Danio has also started nibbling at my snail itself not the shell and it doesn't seem to be in an aggressive manor, always at the back of the snail.