Snail and slime ID please!

Evening all!
Please could I have some help in identifying the snail - I replaced my fake plants quite quickly with real ones so I’m thinking it came in on a plant and I didn’t notice it. The first I saw of it was a tiny pin head size thing moving on the tank glass. In a couple weeks it’s grown to the size of a petit pois and now has attached itself to my air stone and is having a whale of a time.
The second ID required please is the yucky slime on my air stone pipe, it wasn’t noticeable yesterday when I did my changes. I did my changes today and while the pipe was exposed I ran my fingers along it and got it all off and it smelt like ... the mid way point of composting. The rotten, death, baby food kinda smell. What would it be from?
Advice appreciated, as always ☺

The snail is a bladder snail. Not sure about the slime.

The snail is either a Physid or a Lymnaeid - the main difference is the direction the shell curves. Both are pest snails, see this link for how to tell the difference https://www.fishforums.net/threads/freshwater-snail-species-in-the-hobby.424364/

Neither are bad but an important part of a tank's ecosystem. They are only a problem when their numbers get out of control. The way to keep them under control is restricting their food supply. Don't over feed the fish or the snails will eat the left overs; clean the bottom of the tank to remove uneaten food; remove bits of dead plant.


I got that slime on my air line tubing when I had a sponge filter. I've no idea what it was, I just wiped it away when i saw it building up - either remove the tubing from the tank to clean it, or do it in the tank before starting a water change so that you hoover up the bits.

Thank you both, I’m glad the slime seems to be nothing to worry about!

The slime is normal build up. Just take it out and wipe it off.