its a moot point, what ever it was I fear I killed it.
From the side it looked just like a tiny shrimp from dead on it seemed to have a bubble by its head, I took a small piece of Watersprite and tried to move it, it clung on pretty good and unfortunately I used some force and have no idea what happened.
If you look to the right of the snail there is a long smudge mark just below it is what I thought was BRCS.