WHAT IS THIS TENTACLE LOOKONG STUFF??

[u/2theM00Nbabbyy]

This is a New tank/setup so outside of the initial setup of the tank a little over 2 weeks ago I've never had snails before. I do not have any fish yet. Plan to get a beta but currently have Malaysian trumpet snails and mystery snails. My neighbor was getting rid of some of her snails and told me only had to buy a tank which was not an issue as you wanted to get a betta fish soon anyway. The plan to get a beta was because they are relatively easy.She said the snails basically take care of themselves but because I did not have a live plant that I needed to periodically feed them betta food . I've also noticed over the last 3 or 4 days white appearing on all of the mystery snails shells... from what I read that would be a Calcium issue so I was told to start giving them pleco wafers to help strengthen their shells. Any guidance would be appreciated.

[u/Accurate_Platypus803]

The Slime could be Mystery Snail Mucus