Your talking about the little snails on the cerith correct? Cant help with an ID other than to say they dont look vey helpful, maybe even parasitic. Do they seem to be bothering the cerith? Do you have high snail mortality.
The little white ones are parasitic. I heard there are over 6000 different types. If they are on your snails they are probably sucking their blood. I would take them off as many snails as you can and don't stop until you see no more. I'm battling them now myself.
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