narsarius party?

[darb2]

Every evening, for some reason my narsarius snails all come out of the sand, climb the glass or lr for a couple of minutes, at the same time, and go back to the sand, at the same time. :? Are they looking for a good place to have a party? Or is this normal behavior?

 

[GrndHog]

Mine do that as soon as I put food in the tank. They act like they smell the food.