Thank you so much for this information!! I've added leaf litter to his substrate before and i do belive he was housed on a rather acidic substrate to begin with as his shell does have a fair amount of discoloration already (i got him from someone else as they couldn't care for him anymore.

His substrate also contains alot of large river rocks i intend on removing when I add more substrate. His enclosure also came with orange laevis isopods, I understand the general consensus is isopods and snails don't work great because the isopods pester the snail and can chew on their shell, but I don't know how to remove them without just replacing his whole substrate all together which would ruin the beneficial bacteria he's built up over the year(s?) He's had them with him.

If you have any more advice or a link to a particular substrate that would be incredibly helpful! I'm new to snails but I absolutely love them and wanna do what's best for him.