Round discs growing in aquarium

[ron-salt-tank]

Anyone know what these round reddish brown discs are growing on my live sand? About a 30 day old tank setup, cycle pretty well done, nitrites coming down .25, nitrates going up 40 ppm. I'm new to this and just trying to make sure I catch problems before they get out of control.

 

[ByzantineWV]

This looks like a part of a snail that has died did u have any in your tank

 

[Flreefer]

Same thing I was thinking, looks like the end cap of a snail.

 

[spoonman]

+1, there are dead snails in there somewhere.

 

[ron-salt-tank]

I did have two snails die, I never thought that would be part of them. Thanks for the info.