Nerite Snail Burying Itself

[Guupy42]

This morning, I found my Black Racer Nerite Snail partially buried. Later, I could not find it, so I stuck my hand in the tank where it was this morning, and dug through the gravel. It turns out that the snail had completely gone under the substrate. I found the snail, and pulled it out again, but it just started burrowing again. I noticed that the holes in its shell were bigger than it used to be, which I found was caused by acidic water, so I did a 25% water change. The snail has been in my fish tank for about 3 weeks now, but this is the first time it has done this. I also read that it could be a sign of stress, so could anyone help me find some solutions?

 

Five gallon tank with 3 adult guppies and one Nerite Snail

I will give the water parameters once my water test strips arrive.

The snail had some holes in its shell when I first got it.

 

*I circled the snail*

Edited March 14 by Guupy42

[Guppysnail]

This is normal. Most of my nerites sleep buried under substrate throughout the day and are mostly nocturnal.  

[RichNJ]

We once had one disappear for 6 months or more and then magically reappear.  We thought he died underground.  Also, we learned to find him sometimes by looking at the glass on the bottom of the tank.

[Cinnebuns]

Some nerite species do this more than others but they all do it from time to time. Some do it so much they are rarely above the substrate. 

[Guupy42]

Thank you for all the explanations. @Guppysnail, you were right about them being nocturnal. At night, the snail came out again, and is above the substrate again this morning. @Cinnebuns, I have rarely seen my snail do this, this was the first time. I still don't know if this is normal for it or not, but I will find out sooner or later. Again, thank you everyone for the good answers.

[Katherine]

My black racers do this way more than my other nerites. I won't see them for months then they'll be all over the place above the gravel for a few weeks. Rinse and repeat.

[Cinnebuns]

Hair thorn and king koopa nerites are the 2 that primarily stay tunneling. All others have varying degrees of tunneling.