Strange white nuggets on snail

[bettaowner]

i.imgur.com/9KfHI56.jpg
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Hi! I’ve had my black racer nitrate snail for a few months and when I checked on him today he had these little things on him (out of the blue). Last night he seemed fine. We can’t find any information on what this might be... We also found one of these things on our water heater and when we moved the heater it fell. Is it poop? It moves with him when he moves. Anyone have any advice? Thanks!

[cuttlefishgod]

could it be that he's gotten to the tiny stone/sand substrate and some of it has gotten stuck to him? if this is the case it could be really bothering him or even end up hurting him, and I would advise to switch out the substrate to something chunkier or just removing it all together.